United Airlines chief communications officer and former White House press secretary Josh Earnest explains how the program works on ‘America’s Newsroom.’ A United Airlines flight was evacuated ahead of take-off at San Francisco International Airport on Thursday after a teenager sent a picture of an Airsoft gun to other passengers onboard via Airdrop, an iPhone feature that allows sharing between other Apple Inc. products. KNTV reported as the flight bound for Orlando was getting ready to leave the gate, several passengers received the photo of the realistic-looking toy gun, sparking alarm. Everyone on the aircraft was forced to de-board and go through security screening a second time. The teen was not allowed back on the flight.