Passengers wait in long queues at Heathrow Airport as IT problems causedflight delays in London, Britain, August 7, 2019 in this picture obtained from social media.
The problems are the latest in a string of IT failures to have hit the airline.
"Can I have any update on the connection flight please?" he said.
In May 2017, tens of thousands of passengers were stranded when a global computer failure grounded hundreds of British Airways flights over three days. "No idea when we will actually fly #pleasejusttakeoff #sortitout".
British Airways said it is working as quickly as possible to resolve the systems issue which "has resulted in some short-haul cancellations and delays from London airports".
To try to get travellers away staff have gone back to manually checking people in with a clipboard and a smile like it's the 1970s, although this means everything is taking longer and the airline has therefore seen an additional 200 flights delayed already this morning.
The airline is offering short-haul passengers departing from Heathrow, Gatwick and London City the chance to re-book to another day between Thursday and next Tuesday.
Folk travelling with the airline are having problems checking in online at London's lynchpin airports, which is affecting travel across the United Kingdom, including shorthaul flights to other United Kingdom airports.
Today's chaos came around a fortnight after people missed flights or were forced to take off without their luggage at Heathrow when a check-in system went into meltdown.
The problems are affecting flights across its network but not at every airport, it added.
"We are working to support the BA team and passengers impacted".
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