British Airways
The airline said it was ‘likely’ anybody booked to fly on September 9, 10 and 27 will not be able to travel.
Thousands of people received emails overnight.
Flights leaving Heathrow and Gatwick have been affected by the fault, which was resolved on Wednesday afternoon.
“People were crying and hyperventilating. It was genuinely scary."
The airline has released a statement.
The fine is the equivalent of 1.5% of the airline's revenue last financial year.
"We have every confidence in Boeing and expect that the aircraft will make a successful return to service".
Customers can face up to £160 charge – but that might soon change.
All three passenger planes eventually landed more than 90 minutes after their scheduled arrival time.