"We are moving forward, it's an extraordinarily complex project," Macron said after defence and security talks with German Chancellor Angela Merkel.

"In the coming weeks we will have settled the final outstanding points and I firmly hope that by spring we will have the administrative and political confirmations needed to meet our schedule and our ambitions," Macron said.

The Future Combat Air System (FCAS), being built by German, French and Spanish firms, is a key part of Macron's push for military sovereignty on the Continent and his aim to lessen its reliance on the NATO alliance.

So far governments have only approved funding for prototype and design contracts, a small fraction of the multibillion-euro budget for the 20-year project.

Signing contracts for the next studies would mean a one billion euro ($1.2 billion) commitment to building the demonstrator plane, expected to cost six billion euros alone, a source close to the project told AFP.

Both Macron and Merkel want to give the green light before German elections in September and the French presidential contest next year, since it would reduce chances a new government might scrap the project.

But Merkel, speaking in Berlin -- the two leaders talked via videolink -- nonetheless said there were still "lots of questions to clarify" over the division of works among French and German firms.

Airbus and France's Dassault Aviation are spearheading the plane's development, alongside Safran and Thales of France, German engine maker MTU, and the European missile joint venture MBDA.

"We realise the project is led by the French but it should be a project where both countries play equal roles," she said, also evoking talks with Macron over the sharing of intellectual property between the companies.

The new stealth delta-wing jets, which will replace the current generation of Rafale and Eurofighter jets, are set to be operational in 2040.

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DASSAULT AVIATION

AIRBUS GROUP

SAFRAN

THALES