Originally Posted by
YYCCL3
JMK ?
It was not LCA, BCN or INN.
But finally, it was indeed JMK - a location that I think has been much guessed in the past but has never actually featured.
The next clue would have been the following photo, whose background might be more recognisable by those who have been there as it's what you look at when you're by the gates waiting to board (although seldom by climbing the stairs up on to the wing):-
