Fury as customers are incorrectly told their flights are cancelled.
Chaos has erupted as British Airways frantically tries to deal with the planned walkout by pilots next month.
On Friday, the airline sent out emails informing customers that their flights would be either cancelled or delayed.
However, many hours later, BA said the emails were sent out in error to some of its customers.
Amidst the confusion, the airline received 38,000 calls in the first 24 hours, also generating 33,000 tweets during the same period.
By Sunday evening, some passengers had still not been able to contact BA to clarify if they would be affected or not.
“Disgraceful service by @British_Airways,” Dean Walton said in one post.
“Canceling our holiday, then, after we booked alternative flights, they have now emailed saying the original flight isn’t canceled after all.”
The airline has not confirmed how many customers were wrongly sent the email.
In response to one passenger, a BA representative said on social media: “We’re extremely sorry that you’re having difficulties trying to rearrange your flights.
“Our teams have been working tirelessly to help as many of our customers as possible, in these unprecedented circumstances.”
Last month, members of BALPA (British Airline Pilots Association) voted 9-1 in favour of strike action, on a 90 per cent turnout in a dispute over pay.
British Airways subsequently failed in its attempt to block mass walkouts through a court injunction.
The strikes will take place on September 9, 10 and 27.