London , England ( CNN ) -- Union officials were going to court Thursday in London to try to stop British Airways from imposing contractual changes on its 14,000-member cabin crew . The Unite union said it wants the High Court to issue an injunction against the British carrier to stop `` unfair and unworkable '' changes to cabin crew contracts . It was unclear when the court would rule in the case . Among the changes BA wants to impose is a reduction in the number of crew members on flights , Unite said . BA plans to impose the changes starting November 16 , according to Unite . Thursday 's court action is separate from union plans to ballot its members about whether to strike over the Christmas holiday period , a Unite spokeswoman said . Unite still plans to hold the strike ballot , possibly as early as next week , regardless of how the High Court rules , she said . The contractual changes are part of the strike ballot , but other issues include jobs and pay , she said .
Union Unite says it is taking British Airways to court over working changes . BA wants to impose is a reduction in the number of crew members on flights . The union claims that this will lead to more flight delays and cancellations, which could cost passengers up to £150 million per year.