At Corfu there is a McDonald's directly at the gates. A couple of years ago were waiting to get served a McDonald's meal and they unexpectedly started boarding so we took it on board. It felt really wrong for some reasonGet yourself to burger King in the airport and buy 4 XL double cheese with bacon just before you board the flight and make everyone smell the delight during the flight.
I've yet to find a KFC in an airport, its a dream of mine to get on board with a mega bucket and 4 sides of gravy and make everyone envious as they eat there airline grey food!

