Air France-KLM's leisure carrier Transavia France has agreed a five-year lease arrangement under which it will provide aircraft to Canadian carrier Air Transat.
Transavia will supply four Boeing 737-800s for the winter of 2015, increasing the number of aircraft by one for each of the subsequent winters, until it is leasing eight of the type to Air Transat in 2019.
Air Transat will operate the jets, which will be used on routes to Mexico and the Caribbean, it says.
The Canadian operator says it wants to "internalise" narrowbody services and adopt an "accordion fleet" strategy under which it will change the number of aircraft according to seasonal tourism demand.
Air Transat has already agreed to lease four 737-800s from US lessor ILFC.