British Airways has won a High Court injunction to stop the latest strikes by its cabin staff.
The decision was based on a technicality and whether Unite followed rules in contacting its members with strike result details.
The first of four five-day walkouts had been due to begin at midnight, but will not go ahead following Mr Justice McCombe’s decision.
The union has said it will appeal against the injunction decision.
The first strike had been scheduled to begin on Tuesday, ending on 22 May, with the three further strikes planned to begin on 24 May, 30 May and 5 June.