Man Impersonates Passengers to Sneak Onto Delta Flight

• Man boarded Delta flight by taking photos of other passengers' boarding passes and using them to get on plane • Went into lavatory as flight boarded, emerged once plane was moving to seat • Flight attendants realized he wasn't on manifest when they couldn't find his booked seat • Plane returned to gate; man said he needed to get home from Utah and had Southwest buddy pass • Man faces federal charge of being a stowaway on an aircraft