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The U.S gold medalist, Simone Biles, was all smiles as she greeted travelers, made announcements in-flight and even directed air traffic as part of a promotion with United Airlines.

The travellers and even United Airline crew members were surprised and thrilled when Simone appeared and took the reins.

The excited passengers and crew took photos and showed their elation on their social media pages. Biles even helped a gymnast wannabe traveller balance a handstand.

Instagram user sydkay1203 posted this photo with the caption "If I had known I was going to meet Simone Biles I would have dressed better!!"