British Airways and the Unite union are to resume talks later, with the latest cabin crew strike now in its third day.
Unite joint leader Tony Woodley said he hoped they could "pick up the momentum" from their last talks on Saturday. Earlier, BA had said it was planning for a full hearing on the legality of the strike, despite a court ruling in favour of Unite last week. BA stressed that it was not appealing against the decision, but planned to pursue a full hearing anyway.
Some 246 flights in and out of Heathrow were cancelled on Wednesday out of 674 scheduled.
On Tuesday, more than 200 flights were cancelled, though BA maintained that it was meeting its target of flying 70% of passengers to their destinations. BA said it was increasing its flight schedule for Unite's next threatened five-day strike, which is due to start on Monday, 30 May.
The carrier said it would be operating more than 70% of long-haul flights from Heathrow and more than 55% of short-haul flights.