MIAMI — Atlas Air Worldwide Holdings and Boeing have announced an order for the conversion of nine 767 passenger airliners, under the Boeing Converted Freighters (BCF) program.

The U.S. carrier, a leading global provider of outsourced aircraft and aviation operating services, said in a statement that four of the orders were previously announced at the 2016 Farnborough Airshow, which were attributed to an undisclosed customer at that time.

“Boeing has been a longtime and trusted partner as we’ve built our fleet and business,” said President and Chief Executive Officer William J. Flynn, Atlas Air Worldwide Holdings. “We look forward to continuing to work with Boeing to provide operational excellence and support for our customers.”

Based in Purchase, New York, Atlas Air Worldwide has an all-Boeing fleet, including the world’s largest fleet of Boeing 747 freighters and provide customers the broadest array of 747, 777, 767, 757 and 737 airplanes for domestic, regional and international applications.

Of its subsidiaries, Atlas Air operates nine Boeing 767-200(F)s and five 767-300(F)s, while Polar Air Cargo operates two 767-300(F)s.

Last August, Atlas Air and, Inc. showcased its first branded Boeing 767-300 freighter. The jetliner is the first of 40 freighters that Amazon has agreed to lease through air cargo partners, including Atlas Air.

According to Boeing’s Current Market Outlook, the airframer forecasts a need for 400 widebody conversions over the next two decades, with a strong demand for 767 freighter conversions due to a rise in e-commerce.