When an aircraft goes AOG, the maintenance report shows one number. The real bill looks completely different.
Most aviation finance discussions focus on the cost of the part. The broken component. The repair. The shop visit. That number is visible, documented, and easy to report upward.
What rarely makes it into the same conversation is everything else — the cascading financial consequences of the hours and days that pass while procurement teams chase quotes, suppliers don't answer, and a perfectly repairable aircraft sits on the ground waiting for a part that exists somewhere in the world but nobody can find fast enough.
Here's what a 3-day AOG actually costs. Not the maintenance bill. The real one.
The AOG Receipt Nobody Sends You
AOG EVENT — TABLE FOR 1 AIRCRAFT
─────────────────────────────────
Lost revenue (per hour).... $15,000
Wet lease rate (per day)... $45,000
Crew disruption............ $8,000
Passenger compensation..... $12,000
Slot loss (per rotation)... $6,000
Grey market parts risk..... priceless
─────────────────────────────────
TOTAL per 3-day AOG........ $258,000+
─────────────────────────────────
TIP FOR SLOW SOURCING...... everythingEvery line on that receipt is real. And every line grows with every hour the aircraft stays on the ground.
Line by Line: Where the Money Actually Goes
Lost revenue — $15,000 per hour
A grounded narrowbody on a high-frequency route generates between $10,000 and $150,000 in direct lost revenue per day depending on load factor, route, and season. During peak autumn and winter operations — when aircraft are running at maximum utilization to cover seasonal demand — that number sits at the higher end. Three days. One aircraft. The revenue number alone justifies almost any investment in faster sourcing infrastructure.
Wet lease rate — $45,000 per day
When an aircraft goes AOG and the airline needs to protect its schedule, the immediate solution is a wet lease — an aircraft, crew, maintenance, and insurance package sourced from another operator at premium rates. Wet lease rates for narrowbodies have increased significantly over the past two years as demand for temporary capacity has surged alongside the GTF crisis and delivery delays. Airlines that signed wet leases during peak AOG periods in 2025 paid rates that would have covered years of platform subscriptions many times over.
Crew disruption — $8,000+
Crew legality is one of the least visible AOG costs and one of the fastest accumulating. A crew positioned for a departure that doesn't happen goes illegal for the return rotation within hours. Hotels, per diems, repositioning costs, and the downstream scheduling disruption of pulling crew from other rotations to cover the gap — all of it accumulates from the moment the aircraft is grounded. A three-day AOG touching multiple rotations can push crew costs well above initial estimates.
Passenger compensation — $12,000+
EU261 and equivalent regulations in other markets have made passenger compensation a significant and unavoidable AOG cost for airlines operating in major markets. Delays exceeding three hours trigger compensation obligations of €250 to €600 per passenger depending on distance. On a 180-seat narrowbody with a reasonable load factor, a single cancelled rotation can generate €40,000 or more in statutory compensation obligations before hotels, meals, and rebooking costs are added.
Slot loss — $6,000 per rotation
At congested airports, slots are among an airline's most valuable assets. A grounded aircraft that misses its departure slot doesn't just lose that rotation — it risks the slot pair, triggers reporting obligations to the slot coordinator, and in extreme cases jeopardizes future slot holdings at capacity-constrained airports. The financial value of a slot pair at a major hub can run into hundreds of thousands of euros annually. Losing even one rotation at the wrong airport at the wrong time carries consequences that outlast the AOG event itself.
Grey market parts risk — priceless
This is the line that doesn't appear on most AOG cost analyses — but it's the one that can turn a $258,000 problem into a catastrophic one.
When procurement teams are under pressure to close an AOG fast, verification standards can slip. The global parts shortage has created significant opportunity for counterfeit and suspect unapproved parts to enter the supply chain — and the consequences of installing an unverified component go far beyond the immediate maintenance event. The AOG Technics scandal alone affected American Airlines, United Airlines, Southwest, Ryanair, TAP, and Virgin Australia — with over 60,000 fake engine parts with forged Authorized Release Certificates entering the supply chain. The director was sentenced to nearly five years in prison. The reputational and operational cost to the airlines involved dwarfed any sourcing shortcut that enabled the risk.
Fast sourcing and safe sourcing are not a trade-off. They are both requirements.
The Tip Line
The most honest line on the receipt is the last one.
Tip for slow sourcing: everything.
The part isn't the expensive part of an AOG event. The time spent finding it is. Procurement inefficiencies, customs delays, and documentation verification are consistently identified as hidden causes of prolonged aircraft downtime — costs that show up across every line of the receipt but are rarely attributed to the sourcing process that caused them.
Recent studies underline procurement inefficiencies, customs delays, and documentation verification as hidden causes of prolonged aircraft downtime. In an environment where aircraft delivery delays, engine shortages, maintenance bottlenecks, and geopolitical instability are collectively costing airlines more than $11 billion annually, the margin for slow sourcing has effectively reached zero. AeroTimeAeroTime
What Changes When Sourcing Is Fast
The $258,000 receipt above assumes a 3-day AOG. The same event closed in 4 hours looks completely different.
Lost revenue: one rotation missed.
Wet lease: not required.
Crew disruption: managed within legal limits.
Passenger compensation: one delayed flight, not three cancelled ones.
Slot loss: protected.
Grey market risk: eliminated through verified sourcing.
The difference between those two outcomes is almost never the availability of the part. It is the speed and reliability of the connection between the operator who needs it and the supplier who has it.
AOG Today Was Built for the Real Bill
AOG Today is the real-time digital marketplace that eliminates the sourcing gap between a grounded aircraft and a verified part.
Airlines and MRO teams post urgent RFQs in seconds. Verified global suppliers respond with live quotes instantly. Orders close the same day — 24 hours a day, 7 days a week, any time zone, any aircraft type.
No grey market. No forged certificates. No waiting for Frankfurt to open while the wet lease clock runs at $45,000 a day.
The platform is free to try. The cost of not being on it shows up on a receipt that looks exactly like the one above.
Let's close AOG — today.
🔗 aog.today
