A non-stop flight is a flight by an aircraft with no intermediate stops.
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History
The dissolution of the Soviet Union in 1991 eventually opened up Russian airspace, allowing commercial airlines to exploit new circumpolar routes and enabling many new non-stop services.
In the late 2000s/early 2010s, skyrocketing fuel prices coupled with economic crisis resulted in cancellation of many ultra-long haul non-stop flights. As fuel prices fell and aircraft became more economical the economic viability of ultra long haul flights improved.
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References
Non-stop flight Wikipedia(Text) CC BY-SA