Amazon on Tuesday announced its purchase of 11 Boeing 767-300 aircraft. The purchases include seven aircraft from Delta and four aircraft from WestJet, which will join the network by 2022, according to the company.

“Our goal is to continue delivering for customers across the U.S. in the way that they expect from Amazon, and purchasing our own aircraft is a natural next step toward that goal,” says Sarah Rhoads, VP of Amazon Global Air. “Having a mix of both leased and owned aircraft in our growing fleet allows us to better manage our operations, which in turn helps us to keep pace in meeting our customer promises.”

The four aircraft purchased from WestJet are undergoing passenger to cargo conversion and will join Amazon Air’s network in 2021, and the seven aircraft from Delta will enter Amazon’s air cargo network in 2022. The company will continue to rely on third-party carriers to operate these new aircraft.