Union Unite is recommending its British Airways (BA) cabin crew members reject the company's latest offer.
The union will ballot 12,000 staff on the decision over the next week, after negotiations failed to reach an agreement.
A BA spokesperson said it is "extremely disappointing" that Unite is urging its members to discard the offer.
"Despite our financial circumstances, we have put a very fair offer to Unite," said BA.
"We believe this offer addresses all the concerns the union has expressed during the past 14 months: including pay and allocation of routes and crewing levels on some flights, while allowing wider take-up of the popular option of part-time working.
"Unite is showing callous disregard for our customers and our business only a few days after we have begun our recovery from the longest and costliest airspace shutdown in history.
"The union's recommended rejection is clearly out of touch with the majority of crew who worked normally during Unite's previous failed attempts to ground our airline."
Tony Woodley, Unite joint general secretary, said: "It is disappointing that talks with the company have concluded without producing an agreement we can recommend to cabin crew."
"Despite important progress made in a number of respects, management has refused to budge on victimising cabin crew who had their travel concessions withdrawn as a result of the strike. It is also taking vindictive and disproportionate disciplinary action against union members in defiance of the words in the agreement they are asking us to endorse," he said.
Woodley also accused BA of attacking trade unionism.
"These and other actions call into question the sincerity and integrity of management's promises and the value of the other commitments negotiated with them. I believe British Airways is seeking to break trade unionism among its cabin crew by a process of bullying and humiliation. This we cannot and will not accept."
Unite said it is not announcing any further strike plans at this stage, "in view of the continuing disruption to BA's operations caused by the Icelandic volcano eruption and the fact that many passengers remain stranded abroad".
British Airways, however, has accused Unite of preparing for another strike shortly after the General Election campaign ends.
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