Strikes by British Airways pilots could disrupt hundreds of thousands of holidaymakers from August after the airline lost a second legal attempt to block industrial action. The court of appeal on Wednesday upheld last week’s verdict by the high court, which dismissed BA’s claim that the strike ballot was invalid. The pilots’ union, Balpa, can now proceed with planned strikes over pay, as long as it gives two weeks’ notice. The airline carries up to 145,000 passengers a day.