"News of the tie-up was greeted warmly not only in Canada but also in Northern Ireland, where the C-Series’ wings are made. The Democratic Unionist Party, the province’s largest party, which supports the government of Theresa May, the British prime minister, said it was “thrilled” with the deal."

This is quite important too. If the UK had a functioning Foreign Office they would have been wading in on behalf of Bombardier. The DUP have an extremely disproportionate influence at the moment, but at least they're using it to preserve jobs in a deprived area this time.