David Walliams and Matt Lucas raised eyebrows while filming their new series - after nipping to the gents dressed as lay-dees.
The Little Britain duo filmed their forthcoming BBC One comedy Come Fly With Me at a real airport as passengers milled around.
But it meant the comics had to use the facilities alongside confused travellers while dressed as new characters Keeley and Melody, a pair of check-in girls.
David said: "The interesting thing is we get recognised by some British people who might have seen Little Britain.
"But, obviously, as we're in an airport, a huge percentage of people are from other countries who probably don't recognise us and are just utterly mystified as to why there are two men dressed as women having a pee next to them in the toilet."
Matt added: "I think you surrender your privacy."
The pair have created a series of characters who work in or pass through a fictional airport for their new spoof documentary series, which debuts on BBC One on Christmas Day.