British Airways systems have crashed at UK airport this morning, causing chaos for passengers.
Disruption was reported at airports including Heathrow, Gatwick and London City.
The airline said it was having to use a manual check-in process which takes longer than the computerised system.
One passenger described the bag drop area at Heathrow Terminal 5 as almost at a standstill.
BA issued a statement shortly before 9am stating that the problem had been resolved and passengers were being checked in as normal.
It went on: We are sorry for the temporary check-in problems which caused some delays for our customers first thing this morning.
This issue is now resolved and our staff are working flat out to help customers get away on their holidays.
Passengers complained that the airport was complete chaos this morning and some claimed to have missed their flights.
Amanda Porter tweeted BA and said: T5 is absolute carnage with systems down!! Very unhappy customers left right and centre.
She added that it took her nearly two hours to check in because of the hold up.
Passenger Nick Haley also reported there were delays at London City airport.
He tweeted: Uuuuge queues at London City after @British_Airways systems crash and now a 30-45 minute grounding waiting to leave.
Another passenger claimed he had missed his flight because his boarding pass “could not be printed.
Travellers also claimed they were stuck on the runway for over an hour.
The disruption comes around two months after more than 670 flights were cancelled due to a power failure over the spring bank holiday weekend.