Marriott already has an Apple Watch app

The Apple Watch officially goes on sale today and Bethesda-based Marriott International Inc. is all in.

Bethesda-based Marriott has already rolled out an Apple Watch app for members of its Marriott Rewards program for mobile check-in and checkout, reservations and hotel directions.

“Putting our mobile services on the hottest new wearable is an important step in Marriott’s aggressive efforts to create a complete mobile-powered travel experience that puts the guest in total control,” said George…