United Airlines MileagePlus members can win free flights by uploading their proof of vaccination to its mobile app by June 22. They call it “Your Shot To Fly.” Ha ha ha.
The airline will give away a prize each day in June: a roundtrip flight for two, valid for premium class of service to any United destination. On July 1 they will award 5 sweepstakes winners a grand prize of a year of travel, valid for premium cabin to any United destination. (Thanks Gary for the info)