British Airways cabin crew rejected the airline's latest offer in a long running industrial dispute, the Unite Union said on Friday, a move that could herald a third wave of strikes this year.

British Airways said it was disappointed but not surprised and urged Unite to end the dispute.

The union, which represents about 90 percent of BA's 12,000 cabin crew, said 81 percent had voted against the offer and it would hold a meeting on Monday to discuss the next move in the row over pay and working conditions.

Turnout in the ballot was 71 percent, it said.

"BA management should take note of their own employees' strong rejection of their offer and immediately address the outstanding concerns," said Derek Simpson and Tony Woodley, Unite's joint general secretaries, in a statement.

"Unite is fully committed to supporting our members in furthering this dispute if no resolution is found."

The two sides resumed negotiations in April after two sets of strikes in March.

Last week Woodley, recommending crew reject the offer, said despite progress in some areas, BA management had refused to reinstate travel concessions the company withdrew from striking crew.

"Unite has clearly orchestrated a rejection of a very fair offer that addresses all the concerns raised during 14 months of talks," BA said in a statement. "There can be nothing positive gained from further strikes."

BA is aiming to save 62.5 million pounds ($96.7 million) a year to counter falling demand, volatile fuel prices and greater competition. It has estimated the seven days of walkouts in March cost it between 40 million and 45 million pounds.