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
Novak Djokovic has secured his fifth Australian Open title with a four set 7-6 (7-5), 6-7 (4-7), 6-3, 6-0 victory over Andy Murray
Fire crews released a woman from an overturned car after it went off the A12 at Ingatestone in Essex.
Star of cult TV drama The Wire actor Idris Elba has said he sees himself as "an odd, tall black man that doesn't quite fit in".