The meal served over an ocean was assembled hours earlier in a building beside the airfield. Everything about airline food follows from that separation of cooking and serving.
Production happens on an industrial scale
Flight kitchens near major airports prepare thousands of meals a day for many carriers, working to different specifications for each airline and each cabin.
Dishes are cooked, portioned and rapidly chilled, because holding food safely for hours depends on getting temperature down quickly rather than on keeping it hot.
From that point the entire operation is a cold chain, and every step is timed and temperature controlled until the oven on board.
Loading is a slot in the turnaround
Catering trucks lift to the aircraft door and exchange full carts for empty ones from the previous sector. The operation shares ground time with cleaning, fueling and baggage.
Each of these activities has a window, and catering must complete before boarding progresses far, because carts move through the same aisles passengers use.
A late inbound aircraft compresses every window at once, which is when catering errors and shortages become most likely.
Counts are set before the flight closes
Meal numbers are ordered against a passenger figure fixed some hours before departure, not against the final number who board.
Late bookings, upgrades and passengers moving between cabins can therefore exceed the count for a particular dish, which is why choices run out toward the back.
Airlines load a margin, but a large margin means carrying weight and paying for food that is discarded.
Stations differ in what they can supply
A carrier's home base has its own kitchen arrangements and consistent supply. An outstation may be served by a contractor supplying several airlines with a narrower range.
This is why the outbound and return meals on the same route can differ noticeably in style and quality.
On thin routes, airlines sometimes carry meals out and back rather than catering at the far end at all.
Waste rules constrain the return
Food arriving from abroad is frequently subject to agricultural controls and must be disposed of rather than reused, regardless of whether it was touched.
That obligation makes over-catering expensive in a way that has nothing to do with the price of the ingredients, and it pushes airlines toward tighter counts.