Well a passenger plane needs at most 20,000 km (20 Mm) of range, since that is the furthest distance 2 points on the surface of the Earth can be apart. Most lar

Well a passenger plane needs at most 20,000 km (20 Mm) of range, since that is the furthest distance 2 points on the surface of the Earth can be apart. Most large jet airliners cruise at around 900 km/h, which gives a maximum useful endurance of around 22 hours. There's no point having an endurance much longer than that. AFAIK, no airliners can do that yet, though some are getting close. Some of the business jet variants can (e.g. BBJ 777-8, BBJ 777-9). The longest duration 'scheduled' airline flights to date were the Qantas 'double sunrise' flights during WWII, which were ~32 hours long [0], though the Graf Zeppelin (airship) made passenger flights longer than this [1]. 0. https://en.wikipedia.org/wiki/The_Double_Sunrise https://en.wikipedia.org/wiki/The_Double_Sunrise 1. https://en.wikipedia.org/wiki/LZ_127_Graf_Zeppelin https://en.wikipedia.org/wiki/LZ_127_Graf_Zeppelin