Ultralonghaul flights: Marathon airline travel

The longest nonstop flights in the world at nearly 19 hours, Singapore Airlines' Flights 21 and 22, have linked Singapore and Newark, New Jersey, since 2004. The route -- which is flown by Airbus A340s -- is scheduled to be canceled in November. Analysts blame the move on low profitability.

The longest nonstop flights in the world at nearly 19 hours, Singapore Airlines' Flights 21 and 22, have linked Singapore and Newark, New Jersey, since 2004. The route -- which is flown by Airbus A340s -- is scheduled to be canceled in November. Analysts blame the move on low profitability.