pbr Thousands of holidaymakers face travel chaos following a vote for strike action by workers at BAA airports, including Heathrow.br ppbr A ballot over pay involving 6,000 staff belonging to the Unite union resulted in a three to one vote in favour of strike action, Unite said.br ppbr The union will meet with its key representatives on Monday to decide what form of industrial action its members will take. The walkouts will affect Heathrow, Stansted, Southampton, Glasgow, Aberdeen and Edinburgh airports.br ppbr Before the ballot result was announced, Prime Minister David Cameron warned that a strike would achieve nothing "apart from damage".br ppbr But Unite national officer Brendan Gold said: "This ballot reflects what our members feel about BAA's current attitude."br ppbr The union had urged firefighters, engineers and support and security staff at BAA's six UK airports to vote for industrial action over what it called the Spanish-owned company's "measly" pay offer.