Non-stop flight

During the early age of aviation industry when aircraft range was limited, most flights were served in the form of a milk run, aka there were many stops along the route.

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, removing the need of making stopover in-between.

[2] In the late 2000s to early 2010s, rising fuel prices coupled with economic crisis resulted in cancellation of many ultra-long haul non-stop flights.

Starting March 31, 2019, American Airlines started offering non-stop flights from Phoenix, Arizona to London, England,[4] meaning that the plane leaves Phoenix Sky Harbor International Airport and lands at Heathrow Airport.

Conversely, a direct flight simply means that passengers typically would not get off the plane if it stops (lands) at a location between the two cities.