P2F Conversion Cost Breakdown: What Airlines Pay to Convert a Jet

Every year, a steady stream of retired passenger jets gets a second career. The seats come out, a huge door goes in the side, and a plane that once carried tourists starts carrying pallets of sneakers and phone parts instead. It sounds simple. It is anything but. 

A full P2F conversion cost breakdown covers far more than the shop bill, because the airframe itself, the certification paperwork, the parts kit, and the months of lost flying time all land in the same budget.

The gap between a good conversion deal and a bad one usually comes down to numbers nobody talks about at the press-release stage.

Key Takeaways

Converting a passenger jet into a freighter usually costs several million dollars for a narrowbody and tens of millions for a widebody, and that is only the shop portion. Once you add the used aircraft itself, the parts kit, the certification work, and the months the plane sits on the ground earning nothing, most operators end up spending two to four times the quoted conversion price. Even so, the total is often far less than buying a brand-new factory freighter.

Flying411 keeps aircraft, engines, and certified parts listings in one place, along with a directory of the shops and specialists who handle work like this. It is a useful starting point when you are pricing an idea before committing to it.

What a P2F Conversion Involves

P2F stands for passenger-to-freighter. It describes the process of taking a jet that was built to carry people and rebuilding it to carry boxes.

The work is heavy, structural, and tightly regulated. Crews strip the cabin down to bare metal, cut a hole in the side of the fuselage for a cargo door, reinforce the floor so it can take concentrated pallet loads, and rewire large parts of the aircraft. A passenger-to-freighter conversion touches almost every major system on the plane.

Here is the general sequence most programs follow:

1. Strip the cabin. Seats, galleys, lavatories, overhead bins, sidewalls, and insulation all come out.
2. Plug the windows. Most passenger windows get sealed with metal plugs to keep the fuselage strong and simple.
3. Reinforce the structure. New floor beams, stronger floor panels, and roller tracks handle pallet weight.
4. Cut and fit the main deck door. This is the signature step and the most delicate one.
5. Install cargo systems. Locks, rollers, restraint nets, liners, and a rigid barrier behind the flight deck.
6. Update systems. Fire detection and suppression, lighting, air conditioning changes, and avionics tweaks.
7. Test and certify. Ground testing, flight testing, and final signoff before the aircraft can earn money.

Good to Know: The window plugs are not there to save weight alone. A smooth, uniform fuselage skin is easier to inspect and repair over a freighter's long working life, and freighters tend to fly for many years after conversion.

Each of those steps has its own labor hours, its own parts, and its own chance to go sideways. That is why two aircraft of the same type can leave the same shop with bills that differ by millions.

Why Airlines Convert Instead of Buying New

The short answer is price and timing.

A new factory-built freighter is a big-ticket asset with a long order queue. Industry reporting has often placed the cost of buying new at several times the cost of converting a used airframe, and delivery slots for new freighters can stretch years into the future. A converted jet can be flying sooner, and it can be financed with far less capital up front.

There is a second reason that matters just as much. Cargo demand moves in waves. E-commerce peaks, supply chain shocks, and belly-hold capacity swings can all shift the market inside a single year. Conversions let operators add capacity in months instead of waiting on a factory line.

Freighter conversion cost advantages usually show up in three places:

• Lower entry price. A used airframe plus conversion often totals a fraction of a new-build freighter.
• Faster availability. Shop time is measured in months, not years of order backlog.
• Wider choice. Buyers can shop the used market for the best-maintained example they can find.

That last point deserves attention. The used market is where most of the real savings live, and it is also where most of the mistakes happen. If you are trying to understand what drives pricing on a used airframe, the same forces that make used 737s hold their value show up in conversion feedstock too.

Why It Matters: A conversion does not reset the aircraft's age. You are buying a mid-life or late-life airframe with a history, and that history follows the plane into cargo service. The cheapest jet on the market is rarely the cheapest jet to convert.

P2F Conversion Cost Breakdown: The 9 Costs Behind the Final Number

Most published figures cover only the shop portion of the job. The real spend is wider. Here are the nine cost buckets that make up a complete P2F conversion cost breakdown, roughly in the order they hit your bank account.

1. The Feedstock Aircraft

Feedstock is the industry term for the used passenger jet you start with. It is usually the biggest single number in the whole project.

Prices swing hard based on type, age, engine condition, and how many buyers are chasing the same airframe. When lessors extend passenger leases, good feedstock aircraft get scarce and prices climb fast. Reports through recent years have pointed to exactly that squeeze on popular widebody candidates.

A few things drive feedstock pricing:

• Remaining life on the airframe and engines
• Maintenance status and how soon the next heavy check is due
• Weight variant and payload capability
• Number of previous operators and quality of records
• How many similar aircraft are available at the same moment

Anyone sizing up a candidate should treat this like a purchase decision first and a conversion decision second. Understanding what sets aircraft values before you shop saves a lot of pain later.

2. The Conversion Kit

Every certified program uses a kit. The kit includes the cargo door assembly, floor beams, reinforcement structure, cargo handling hardware, wiring bundles, and hundreds of smaller parts.

Kits are engineered to fit most airframes of a given type, but not perfectly. Conversion houses have noted that a standard kit covers the large majority of the work, while the rest needs aircraft-specific engineering tied to that exact serial number. Those custom pieces take lead time to design and build, and lead time costs money.

Heads Up: Kit lead times are often quoted in months before your shop slot even opens. Booking a slot without securing kit availability is one of the fastest ways to lose a season of flying.

3. Labor and Shop Time

This is the number most people mean when they ask about conversion cost. Published estimates have generally placed narrowbody conversions in the low-to-mid single-digit millions of dollars, with widebodies climbing well into the double digits. Reported figures for popular programs have included roughly four million dollars and up for a 737-800 class airframe, several million more for an A321, and mid-teens to twenty-plus million for widebody types such as the 767-300ER and A330-300.

Treat all of those as moving targets. Labor rates, shop location, and market demand shift them constantly.

The 737-800BCF conversion price tends to sit at the friendlier end of that spread, which helps explain why the type has been such a busy program. The A321P2F conversion usually costs more per aircraft but offers more container-friendly volume, so operators weigh the two against their own route maps.

4. The Main Deck Cargo Door

The main deck cargo door deserves its own line item because it is the hardest part of the job.

Cutting a large opening in a pressurized fuselage means removing structure that was carrying loads, then replacing that load path with new frames, doublers, and surrounds. The door itself is a heavy powered assembly with its own latches, sensors, and warning systems. Fitting one requires precision jigs, shoring to hold the fuselage shape, and careful sequencing.

Programs have publicly described door installation as a major milestone in the schedule, and improvements to door sequencing have been credited with trimming weeks off delivery timelines. When a conversion runs late, the door area is often where the trouble started.

Pro Tip: Ask a conversion house how many doors of your exact type they have installed, not how many conversions they have done overall. Repetition on your specific airframe is what keeps the schedule honest.

5. Certification and the STC

A conversion changes the aircraft's approved design, so it needs regulator approval. That approval usually comes as a supplemental type certificate, or STC, issued by the FAA, EASA, or another authority.

The STC covers the engineering data, the installation instructions, the testing evidence, and the limitations that apply afterward. Most operators use an existing STC from an established program rather than developing their own, which is far cheaper and much faster.

Costs here include:

• STC license or royalty fees built into the conversion price
• Validation of a foreign STC by your own regulator, when needed
• Ground and flight test support
• Updated manuals, weight and balance data, and loading documentation

Certification dollars are usually modest compared to labor. Certification delays, on the other hand, can be expensive, because the aircraft sits idle while paperwork clears.

6. Maintenance Catch-Up

This is the sleeper cost. A conversion is a perfect moment to knock out heavy maintenance, since the plane is already opened up and out of service. It is also a moment when hidden problems come to light.

Common catch-up items include:

• Due or nearly due heavy checks
• Corrosion findings once the interior comes out
• Structural repairs that need review under the new STC
• Engine shop visits or overhauls
• Landing gear overhaul
• Replacement of life-limited components

Timing a conversion near a scheduled heavy check can make good sense, which is why understanding how check intervals stack up matters at the planning stage. Engines are their own budget universe, and the way engine overhauls are priced and scheduled can swing a project by millions.

Keep in Mind: Corrosion and old repairs are the two findings that most often turn a fixed-price conversion into a variable-price one. Both come to light after the cabin comes out, which is after you have already committed.

7. Parts, Traceability, and Documentation

A converted freighter needs a mountain of paperwork to match its new hardware. Every installed component needs proper release documentation and a clean history.

Budget for:

• Certified new and serviceable parts, with correct release tags
• Records review and reconstruction where documents are thin
• Back-to-birth traceability on critical components
• Translation and validation of records from prior operators

Buyers pricing parts strategy should understand the difference between used serviceable and factory-new stock, since that choice alone changes the parts budget meaningfully. Documentation standards matter too, and knowing how release paperwork differs between authorities prevents ugly surprises during acceptance. For components with hard limits, tracking life-limited parts properly is not optional.

Missing or messy records are one of the quiet killers of conversion economics. They slow the project, they reduce the value of the finished aircraft, and they follow the plane forever. The link between records quality and resale value is direct and well understood in the market.

8. Downtime, Financing, and Insurance

While the jet is in the shop, it earns nothing. That is a cost, even though no invoice arrives for it.

Reported conversion timelines vary widely by type. Narrowbody work is often described in the range of a few months of shop time, while widebody programs have been described as taking a year or more from induction to delivery. Add the wait for a shop slot and kit lead time, and the total clock from decision to first revenue flight can be long.

During that stretch you are still paying:

• Interest or lease costs on the airframe
• Hull and ground risk insurance
• Storage and preservation if the plane waits for a slot
• Staff, planning, and oversight
• Ferry flights to and from the conversion facility

Quick Tip: Build a downtime line into the budget from day one. Give it a real dollar figure per month. It turns schedule slips from an abstract annoyance into a number your team can manage.

9. Finishing, Paint, and Delivery

The last stretch is smaller but far from free. It includes cargo liner installation, placards, livery paint, cabin barrier fitting, weighing, acceptance flights, and the ferry to home base.

Paint alone on a large jet is a meaningful expense, and it usually happens at the end when budgets are already stretched. Registration changes, import duties, and delivery inspections round out the list.

Flying411 lists overhauled engines, certified parts, and avionics alongside its aircraft inventory, which makes it easier to line up the hardware side of a conversion project without chasing a dozen separate suppliers.

Narrowbody vs Widebody: How the Math Changes

The two categories are different businesses wearing similar clothes.

A narrowbody freighter conversion targets short and medium routes, e-commerce feeder networks, and express parcel work. The aircraft cycles often, flies into smaller airports, and does not need long-haul yields to pay for itself. Entry cost is lower and the pool of candidate airframes is deep.

A widebody freighter conversion targets long-haul trunk routes and heavy freight. The capacity jump is dramatic, but so is every cost involved. Feedstock is scarcer, the shop time is longer, the door work is bigger, and the financing is heavier.

Choosing between platforms is a route planning exercise first. Comparisons like how the 777 and 787 stack up or how the A350 measures against the 777 are useful background, since the passenger versions of these jets are the feedstock pool of tomorrow.

Fun Fact: The 747 built much of its early reputation on cargo, and its raised flight deck was designed partly so a nose door could swing open for straight-in loading. Freight was baked into the design from the start. That heritage is part of why the 747 eventually wound down as newer twins took over.

How Long Does a P2F Conversion Take

Time is money in this business, so the schedule is part of the cost breakdown.

The full clock usually runs like this:

1. Feedstock search and purchase. Weeks to many months, depending on market tightness.
2. Engineering and kit lead time. Often several months before the shop slot opens.
3. Shop slot wait. Popular lines book far ahead.
4. Conversion work. A few months for narrowbodies, considerably longer for widebodies.
5. Testing and certification. Weeks of ground and flight validation.
6. Delivery and entry into service. Paint, ferry, crew training, and first revenue flight.

Miss on any one of those and the whole chain slides. Conversion planners often say the aircraft should be selected to match the shop slot, not the other way around.

Heads Up: Treating a conversion like a quick flip usually backfires. The cost of a rushed project tends to show up later as downtime, lease friction, and rework.

What Pushes the Price Up or Down

Two identical-looking jets can produce very different invoices. These are the biggest swing factors.

Pushes the price up:

• Older airframe with high cycles
• Corrosion or unrecorded repairs found during teardown
• Engines near overhaul or with weak green time
• Incomplete or poor-quality records
• Tight feedstock market driving airframe prices higher
• Custom engineering for an unusual configuration
• Currency swings and cross-border logistics

Pushes the price down:

• Mid-life airframe fresh from a heavy check
• Single-operator history with clean documentation
• Common weight variant with a standard kit fit
• Multiple aircraft converted under one contract
• Flexible delivery timing that lets the shop optimize its schedule
• Buying during a soft feedstock market

Depreciation plays into this too. The reasons aircraft lose value quickly early in life are the same reasons mid-life jets make sensible conversion candidates. The value has already come out, and the airframe still has years of useful work left in it.

Good to Know: A conversion can extend an airframe's earning life considerably. Cargo aircraft typically fly fewer cycles per year than passenger jets, which is part of how long a well-maintained 737 can keep working.

Does the Investment Pay Off

The finished number only matters against what the aircraft can earn.

Operators build the case around a handful of variables:

• Cargo yields on the routes they plan to fly
• Utilization, meaning hours flown per month
• Operating cost per hour, including fuel, crew, and maintenance
• Residual value at the end of the ownership period
• Financing terms on the total invested amount

The relationship between direct and indirect operating costs is worth understanding here, because freighter economics live and die on cost per hour. Cargo operators use their own version of the seat-mile math that passenger airlines rely on, and the logic behind how carriers calculate unit cost translates directly to tonne-mile thinking.

Residual value matters more than many first-time buyers expect. Converted freighters have generally held value well when the conversion came from a reputable program with solid support, and the broader principles of how residual value is estimated apply here too.

Engine choice affects the whole picture as well. Fuel burn differences between generations, such as the gap between the CFM56 and LEAP families, shape operating cost for the life of the aircraft.

Thinking about a conversion project or trying to price out what your current airframe is worth as feedstock? Start with a valuation on Flying411 and see where your aircraft stands before you commit to a shop slot.

Common Budget Mistakes to Avoid

A few patterns show up again and again in projects that go over budget.

1. Quoting only the shop price. The conversion invoice is one piece of a much bigger number.
2. Skipping a thorough records review. Documentation gaps get expensive fast.
3. Ignoring engine status. An engine event can cost as much as the conversion itself.
4. Assuming the shop slot is the start date. Kit lead time comes first.
5. Underestimating downtime. Every extra month is real lost revenue.
6. Buying the cheapest airframe available. Cheap usually means someone else already passed on it.
7. Planning routes after the purchase. The route map should pick the aircraft, not the reverse.

Keep in Mind: The strongest conversion projects tend to start with a route plan and a firm slot, then go shopping for an airframe that fits both. Reversing that order is where budgets slip.

Buyers new to this side of the market also benefit from knowing how to check what they are buying. Confirming that a part is airworthy and knowing the warning signs of counterfeit hardware protects both safety and resale value.

Conclusion

A realistic P2F conversion cost breakdown looks nothing like the single number in a headline. The shop bill is only the middle chapter. The used airframe usually costs more than the conversion, maintenance catch-up can rewrite the budget overnight, and every month of downtime quietly adds to the total. 

Get those pieces right and a converted freighter can be one of the most cost-effective assets in a cargo fleet. Get them wrong and the savings vanish before the first pallet is loaded.

The good news is that none of these costs are mysterious. They are just easy to overlook when the excitement of a new freighter takes over.

Ready to price your next move with real numbers instead of rough guesses? Browse aircraft, engines, and certified parts, or list your own airframe, at Flying411.

Frequently Asked Questions

Can any passenger aircraft be converted into a freighter?

No. A conversion needs an approved program and a supplemental type certificate for that specific aircraft type and variant. Types without an active program cannot be converted through a normal commercial path.

Do converted freighters carry as much as factory-built freighters?

Usually a little less. Converted aircraft often carry a modestly lower payload and sometimes slightly less usable volume than a purpose-built freighter of the same family, which is one trade-off for the lower purchase price.

Who performs P2F conversions?

Work is done by certified conversion houses and MRO providers, including manufacturer-backed programs and independent engineering firms that hold their own STCs. Each program has its own approved data, kit, and shop network.

Does a conversion affect aircraft insurance?

Yes. A freighter has a different risk profile, different loading operations, and a different hull value, so insurance terms are typically renegotiated after conversion.

Can a converted freighter be turned back into a passenger aircraft?

In practical terms, no. The structural changes, window plugs, and floor modifications make reversal so expensive that it is essentially never done commercially.