Delta Air Lines said a person was able to board a flight in Seattle without a ticket or boarding pass. After the discovery, the plane was turned around just before takeoff.

Delta Air Lines' Comfort+ seats offer travelers an affordable upgrade option. Travelers with a Comfort+ ticket get additional legroom, dedicated overhead bin space, and priority boarding.

Robert Alexander/Getty A Hawaii-bound Delta Air Lines flight from Seattle ... TSA screening and onto the plane without presenting a boarding pass at the gate. They were found while the flight ...