At Heathrow's Terminal 5, the queue to re-book cancelled flights with British Airways stretches almost the entire length of the terminal building.
One family, about three-quarters of the way up, said they had already been waiting an hour and a half.
They were due to fly to Frankfurt this morning but their flight was cancelled. They don't know whether they may be able to get on a flight tonight or have to wait until tomorrow morning.
Airport staff are moving through the queue handing out bottles of water.
Despite the disruption, and the huge number of frustrated passengers waiting for news, there is a surprising calm in the terminal as people wait patiently to discover if and when they will be able to leave.
More top news
A chilly night with widespread frost and fog in some parts of the UK which will be slow to lift in the morning.
Uptown Funk, his collaboration with Bruno Mars, reached number one in the charts again this evening.
ITV News spoke to Nick Channing-Williams who described the freezing conditions on board the car ferry that caught fire earlier today.