The Cathay Pacific Airways Flight Attendants Union is considering filing a Labour Tribunal claim for unpaid holiday pay.
'If they are unwilling to negotiate, we have no choice. This is money that Cathay Pacific owes us,' union chairwoman Becky Kwan Siu-wa said.
The Cathay Pacific union and its counterpart representing British Airways flight attendants in Hong Kong have been trying for several years to get holiday allowances they say their members are due.
Last year Dragonair, in a settlement with its flight attendants' union, agreed to pay cabin crew their basic salary and allowances on public holidays and when they take annual leave.
The airline, a wholly owned subsidiary of Cathay Pacific that manages its staff separately, also agreed to backdate the payments six years - the first local airline to do so.
If Cathay Pacific were to strike a similar deal with the union representing its flight attendants, it could involve millions of dollars in back pay for the company's 7,000 flight attendants.
Those who had worked for the company for the past six years could be entitled to between HK$28,000 and HK$50,000 each, Ms Kwan said.