The current five-day strike by British Airways (BA) cabin crew has entered its fourth day after fresh talks between the airline and the Unite union failed to reach a solution.
The latest talks between the company and the union, which represents cabin crew, broke up late on Tuesday without agreement and there was no indication as to whether progress had been made, the BBC has reported.
A spokesman for conciliation service Acas said it would be in touch with both sides to arrange a future meeting date.
The current strike is the second of three five-day walkouts planned by BA cabin crew, in a row over jobs, pay and working conditions.
One major stumbling block is the travel perks given to crew; Unite is demanding that BA reinstates the travel perks of striking workers, and cancels disciplinary proceedings against others.
The union has offered to call off the strikes if the travel concessions are put back in place, ahead of agreeing a final deal. BA said it has offered to reinstate travel concessions, but only as part of a final agreement.
Last month, Unite won an appeal against a High Court ruling that found its planned strikes against BA were unlawful. The court had ruled the strikes had to be postponed because the union had failed to provide its members with sufficient details of the breakdown of the ballot results.