Members of the British Airline Pilots Association (Balpa) and Rail, Maritime and Transport union (RMT) will vote on whether to stage walkouts.
The move, if backed by staff, would spell double summer holiday hell for thousands of Brits at the peak season.
Balpa general secretary Brian Strutton said three unions representing 40,000 BA workers have been trying to negotiate a pay deal.
He said: “For the pilots that Balpa represents, it is quite simple – BA has been enormously profitable, and the employees should have a fair share of that success which, after all, they produce for the company.”
Yet this is despite BA offering a 11.5% pay rise over three years, and already reportedly paying captains upwards of £200,000 a year.
The airline said it remains in talks with Unite and GMB, both of which have yet to ballot their members.
British Airways said in a statement: “We are extremely disappointed that Balpa has raised the prospect of a ballot for industrial action.
“We urge them to join us for mediation with the conciliation service Acas, to reach an agreement and protect hard-working families planning their summer breaks.
“We believe our pay and benefits for pilots are among the best in the industry, with around 1,000 applications from pilots who want to move to us from other airlines every year.”
Meanwhile, around 2,000 RMT members on London Undergound are being balloted in a dispute over union claims that job losses are being planned as part of an alleged transformation programme.
A TfL spokesperson said: “Over the next three years we will continue to reduce our operating costs whilst delivering improvements to our service, and we are consulting fully with our staff and trade unions before any changes are confirmed. “None of this will compromise the safety of customers or staff, which will always remain our top priority.
“We hope that the RMT will engage with us in this consultation process.”
British Airways would reportedly see its pilots walk out as early as the start of August if strike action is approved.
It comes after the airline, which has offered out inflation-busting pay rises, saw talks with Balpa break down.
The British Airline Pilots Association (Balpa) represents around 3,500 of BA’s 4,500 pilots, while Unite and GMB – who remain in talks with BA – represent other BA employees from cabin crew to engineers.
Pilots are currently restricted by safety regulations to work a maximum of just over 17 hours a week so they are not over-tired.
With this, they also receive generous perks such as heavily discounted flights for themselves and their family.
But despite BA offering pay rises, including a 4% hike this year – double the current rate of inflation – Balpa described the offer as “too little too late”.
It is demanding that its members also receive a share of the profit, as well as a bigger pay rise.