The British Airline Pilots Association (Balpa) voted for industrial action after three days of pilot salary negotiations failed to resolve the dispute. BA's owner, International Airlines Group (IAG) sought a hearing in the High Court, but it was overturned. BA then appealed, but the Court of Appeals ruled the airline on Wednesday.
How much do BA pilots pay?
The salaries of pilots depend on the type of aircraft and the length of service.
to the job and recruitment site Glassdoor is the average salary for a BA pilot £ 88,347 per year.
These range from £ 26,000 to £ 120,000 per year, but jump up to £ 168,000 per year for international pilots.
According to the Aviation Job Search blog, BA is "one of the best airlines to fly for in terms of average salary."
The blog adds: "Our calculations suggest that a long-distance pilot with much experience can well reach the £ 1[ads1]50,000 mark."
Balpa teamed up with other Unite and GMB unions to file a joint pay claim in November 2018
In July, BA pilots offered a wage increase worth 11.5 percent over three years, which was accepted by Unite and GMB but rejected by Balpa.
Of BA's 4000 pilot s, 93 percent voted to take industrial action after rejecting the pay agreement.
BA says the offer is "fair" but Balpa claims members deserve better as the airline has earned a high.
In 2018 IAG reported a pre-tax profit of € 3 billion (£ 2.8 billion), up almost 9.8 per cent from the previous year, and declared a special dividend of € 700 million.
British Airways contributed £ 1.96 billion to it, up 8.7 per cent from 2017's figures.
Balpas Secretary General Brian Strutton said: "BA Unfortunately, attempts to defeat the democratic view of their pilots in court, rather than treating us across the negotiating table, have wasted large amounts of time and money that could have been put into finding a peaceful resolution.
"The negotiation and compromise window is closing fast … there is a serious question here, and BA has so far refused to help us deal with it."
British Airways said it was "disappointed" that Balpa had "chosen to threaten the holidays of thousands of customers.
No strike date has been set yet, but they are expected to drop in August.
Balpa is required by law to provide 14 days notice of any proposed strike action.
BA said it would "pursue all avenues" to resolve the dispute, and this could include further negotiations or a compromise.
BA flies around 145,000 passengers per day in the summer, and a strike can significantly damage reputation and the airline's economy.