WASHINGTON, Jan 31 (Reuters) - Qatar Airways Chief Executive Akbar Al Baker unveiled a provisional order for up to 50 Boeing 737 MAX 10 on Monday as he confirmed a separate inaugural order for 34 Boeing 777X freighters, becoming the first buyer of the future cargo plane.

The order for the longest-range version of the medium-haul 737 MAX confirms an earlier Reuters report and comes days after Airbus revoked a deal with the same airline for the competing A321neo, as part of a dispute between the two companies. (Reporting by David Shepardson, Editing by Tim Hepher)