Thanks, it is indeed a bit more complicated than I first thought! There is a sweet spot: "Above a certain distance it becomes more fuel-efficient to make a half

Thanks, it is indeed a bit more complicated than I first thought! There is a sweet spot: "Above a certain distance it becomes more fuel-efficient to make a halfway stop to refuel, despite the energy losses in descent and climb." [0] [0] https://en.wikipedia.org/wiki/Fuel_economy_in_aircraft#Flight_distance https://en.wikipedia.org/wiki/Fuel_economy_in_aircraft#Fligh... Interesting tidbit (from the same): Very long non-stop passenger flights suffer from the weight penalty of the extra fuel required, which means limiting the number of available seats to compensate. For such flights, the critical fiscal factor is the quantity of fuel burnt per seat-nautical mile. For these reasons the world's longest commercial flights were cancelled c. 2013. An example is Singapore Airlines' former New York to Singapore flight, which could carry only 100 passengers (all business class) on the 10,300-mile (16,600 km) flight. According to an industry analyst, "It [was] pretty much a fuel tanker in the air."