OAG, of course, is a top airline data provider, but they also specialize in airline schedules (OAG once stood for "Official Airline Guide"). To help us answer the question, OAG provided Today in the Sky with the 50 longest regularly scheduled flights that depart from the United States and Canada.
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You can see the list in the above gallery, starting with No. 50 – Vancouver, Canada, to Auckland, New Zealand – and going the whole way through No. 1: Atlanta to Johannesburg, South Africa.
The list was compiled with flights operating as of Aug. 12, 2014, and looks only at departures leaving the U.S. and Canada. The list of "longest" flights is based on the nautical mile-distance of the flights flown. Some recently added flights – such as Emirates' nonstop from Chicago to Dubai and China Southern's from New York to Guangzhou – are recent additions to the "top 50."
The list will be due for another shake-up in September when Qantas begins flying an Airbus A380 from Dallas/Fort Worth. Currently, the carrier flies nonstop from Sydney to DFW on the U.S.-bound leg, but the return portion – the U.S. departure – stops in Brisbane. That will change once Qantas puts its A380s on the route.
But, for now, click through the list to see the 50 longest U.S. and Canadian departures as of Aug. 12.