I always get them mixed up. Which direction do planes on long haul flights usually need a fuel stop? I want to say eastbound....because I'm thinking there is increased wind and therefore higher fuel burn. But doesnt the prevailing winds flow from west to east? That would give an eastbound a tailwind.
I've seen several flights on the trackers that are able to make long hauls westbound but not eastbound. For example, a flight out of New York can go to HKG non stop but coming back they will probably need a fuel stop. Freighters thatgo between Huntsville and Asia can go westbound non stop but almost always stop in ANC on the way back, with 742's sometimes needing an extra stop.