Shorts - which is owned by Canada's Bombardier - cut 600 jobs in May.
Then it moved into the executive jet business to compete with Cessna and Bombardier.
Bombardier announced 1, 400 job cuts after losing out on the Thameslink deal in June.
Canadian-owned Bombardier, which employs 3, 000 people in the city, said it was reviewing its operations.
Alcoa was also selected to supply metallic solutions for regional and business jets to Bombardier.
Michael Ryan, General Manager, Bombardier Aerospace, Belfast, said the firm took its environmental responsibilities seriously.
The company makes parts for aeroplanes and its clients include Bombardier, Thales and BE Aeorspace.
"Bombardier, being a family-owned company, has always thought about the long term, " he says.
He is replaced by a triumvirate that includes two members of the founding Bombardier family.
Last week, a delegation of Derbyshire Conservative MPs saw the Prime Minister to press Bombardier's case.
BBC: Siemens let off steam in latest Bombardier rail jobs row
We need government money to go into Bombardier to reduce the number of redundancies.
Fifty-three passengers were scheduled to be on board the Bombardier CRJ700 regional jet for the flight.
That suggests a buoyant sector with engineering companies like Bombardier, Wrightbus and FG Wilson all doing well.
Boeing competes in the commercial aircraft market with aerospace giant Airbus as well as Embraer and Bombardier.
FORBES: Boeing Delays Dreamliner Deliveries to Air India Again in Worrying Sign
The city council and Marketing Derby called have called for a meeting with Bombardier's directors in Berlin.
BBC: Derby leaders plan to visit Bombardier bosses in Berlin
The acquisition rocketed Bombardier to number one among the world's train builders, adding significant capacity in Europe.
Smaller manufacturers, such as Embraer of Brazil and Bombardier of Canada, are also establishing ties with China.
Contracts with a host of foreign vendors such as Bombardier, Alstom, Thales , Mitsubishi and Parson Brinkerhoff must be managed.
Claire Bombardier, the lead author of the manuscript, did not return repeated calls for comment earlier this week.
Bombardier has already laid off 1, 400 workers and has warned about the future of its Derby production base.
Without new orders for Bombardier, they fear the UK's last train making production hub will disappear for good.
BBC: Siemens let off steam in latest Bombardier rail jobs row
Plans to sell the company to Boeing, Bombardier and others also fell through.
At Bombardier, how are they making their new C Series airplane a success?
Conspiracy theorists watching the Bombardier story develop will make much of this.
And Bombardier said it would have been at a "distinct disadvantage" if Canada had not provided the loan subsidy.
Boeing competes in the commercial aircraft market with the European aerospace giant Airbus as well as Embraer and Bombardier.
Bombardier Aerospace employs about 26, 900 globally with 5, 300 of its workforce in Belfast.
BBC: NEWS | UK | Northern Ireland | 645 jobs going at aerospace firm
They want the Department for Transport to speed through other government rail contracts to give Bombardier a chance.
BBC: Siemens let off steam in latest Bombardier rail jobs row
Bombardier can't persuade the government to buy the trains it makes in Britain.
As such, Paul has been Le Grand Fromage in both government and later with Bombardier in a big global MNE.
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