There was a period of time during which BA was not able to cater flights out of LHR; I can't remember the circumstances -- perhaps a labor (or labour, as the case may be), issue. All J and F passengers were given a voucher (my recollection is that it was for £28, though I don't know why that number is sticking in my head) that could be used in any of the T5 cafes and restaurants. It's not a perfect solution, as some people still get excited by airplane food, but AA would be smart to do the same.