OK, instead of:
<<Stacking—whereby aircraft are kept waiting in the air around the airport before air traffic control gives permission to land>>
Try something like:
Aircraft are held, some distance from the airport, before being directed by ATC into the landing sequence.
I am sorry that some people don't share my views and descend to insults but it concerns me that Joe Public knows so little about what goes on. I believe that it would be better to educate rather than baffle them. I live to the west of Heathrow and there only have to be a few days of easterlies before the moans appear in the local paper and councillors express concern about "changed flight paths", etc.