May took to Twitter to vow she'd work with the Montreal- based company to protect jobs. The prime minister had previously lobbied President Donald Trump after US aircraft maker Boeing alleged that Bombardier used unfair government subsidies to sell planes at artificially low prices.
May has a key alliance with Northern Ireland's Democratic Unionist Party to support her minority government in Parliament.
Defense Secretary Michael Fallon warned Boeing that its behavior could jeopardize future UK defense contracts, though the defense ministry said existing contracts with Boeing would be honored.
But unions accused the prime minister of failing to protect workers. Ross Murdoch, national officer for the GMB union, said the ruling was a "hammer blow" to Belfast, where Bombardier makes aircraft wings and fuselages.
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"Theresa May has been asleep at the wheel when she could and should have been fighting to protect these workers," Murdoch said. "It's high time she woke up."
Boeing alleges that Bombardier received at least USD 3 billion in subsidies from the governments of Britain, Canada and the province of Quebec, allowing it to sell planes to US- based Delta Air Lines for less than the cost of production.
The Chicago-based aircraft maker asked the Commerce Department and the US International Trade Commission to investigate what it called "predatory pricing."
Bombardier valued the firm order at USD 5.6 billion based on the list price of the aircraft.
Delta says Boeing doesn't even make the 100-seat planes it needs for short- to medium-range trips.
Bombardier called the decision "absurd," and accused Boeing of trying to stifle competition.
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