Couillard made the comment in Vancouver, where Trudeau met premiers to discuss climate change.
During a joint news conference with Ontario Premier Kathleen Wynne, Couillard told reporters that federal money for Bombardier would be a good investment for Canada.
WATCH:Quebec Premier Philippe Couillard says he plans to raise the issue of troubled Canadian industrial giant Bombardier with Prime Minister Justin Trudeau once again, coming off a recent round of layoffs at the company.
“This…aeronautical company in particular, and the CSeries in particular, are probably the most important innovative project in Canada,” said Couillard.
“[It] will benefit all of Canada, yes Quebec, but also Ontario and other parts of the country.”
Wynne agreed, saying that Bombardier employs Ontario workers as well.
Couillard compared the aerospace industry to Ontario’s auto sector that has received federal help in the past.
“Frankly, what we expect is that Bombardier and the aeronautical sector…will be supported by both governments as the auto sector was supported years ago,” he said.
“That’s the fundamental thing we need to repeat again and again.”
Quebec has already pledged $1 billion for the struggling aerospace giant, which is trying to sell its mid-sized C Series passenger jet to world airlines.
The Trudeau government has not yet decided whether to fork over federal dollars to the Montreal company, with Transport Minister Marc Garneau saying Ottawa will decide on the matter “in due course.”
Bombardier has been losing money and announced last month that it’s cutting 7,000 jobs over two years, including roughly 3,000 in Canada – and 2,400 in Quebec alone.
WATCH: Bombardier cuts
Talk of federal aid to the company has been controversial, especially in the west where Saskatchewan Premier Brad Wall said the slumping oilpatch deserves cash as well.
Bombardier has reportedly asked Ottawa to match Quebec’s $1-billion pledge.
Couillard also appeared to make an appeal to national pride before the media on Wednesday.
“This [C Series] plane was designed, invented in Canada, it’s the first commercial airliner certified in Canada, made in Canada, we have to support that,” he said.
© 2016 Shaw Media