Heathrow Airport information screens failpublished at 14:59 British Summer Time 4 October 2018
Staff at Heathrow Airport resorted to writing flight updates on whiteboards after information screens failed earlier.
Passengers at the UK's busiest airport were asked to use phones or tablets if possible to find out which gate their flight was leaving from.
Extra staff were deployed in terminals to help people get where they needed to go.
In a statement, the airport said the situation had been resolved by 09:00 BST.
"Heathrow colleagues will remain on hand to help passengers if needed. We apologise for any inconvenience caused this morning," they said.