Thomas Cook cabin crew have voted in favour of a strike over a health and safety dispute, involving rostering rest breaks, according to the Unite union.
Thomas Cook Airlines claim they have plans in place to ensure customers would still go on holiday in the event of strikes.
For a strike to go ahead, the union needs to give Thomas Cook seven days' notice, and that notice has not yet been served.
The airline reduced its cabin crew's breaks from one 20-minute break every six hours, to one 20-minute break every 12 hours worked - the safety minimum indicated in the Civil Aviation Authority's guidelines.
Unite says crew should have at least two 20-minute breaks every 12 hours.
A spokesman for Thomas Cook Airlines said: "We're disappointed Unite cabin crew members have taken the decision to vote for strike action.
"The safety of both our people and our customers is our top priority and we rigorously adhere to the rules around crew breaks."
"Meanwhile, we've put together plans to ensure that our customers will still be able to go on holiday, despite any possible strike action."
Thomas Cook Airlines has a fleet of 31 planes, employs 2,500 people and has its head office at Manchester Airport.
Sources BBC NEWS, AP, Reuters, CNS.
JULIAN BRAY +44(0)1733 345581 Aviation Expert, Journalist & Broadcaster, Aviation Security & Airline Operations Expert, Travel / Maritime & Cruise Industry, NUJ, EQUITY, LIVE ISDN LINK, Broadcast ISDN COOBE ++44 (0)1733 345020 e&oe Old faithful NOKIA: 07944 217476 www.aviationcomment.com