I've recently done a couple of long-haul flights and it got me wondering about food waste on planes. Apart from it being a major logistical exercise, obviously the passenger numbers will be known, but most airlines offer a choice of main meal - what happens to the ones which aren't used? And the parts of meals which aren't eaten? For example I was given a bread roll and butter in packaging which I didn't open - are they just thrown away?
I guess nobody goes through the waste bags the cabin crew fill, but it must be a huge waste of both food and money. Can anyone who works in the industry shed any light?