I am always surprised to read about how many people flying from the US to Europe mention jet lag. The flights look to be mostly under 10 hours.
As Australians we often spend 25-35 hours on multiple flights to get to Europe. Our last trip to Oslo was 40 hours from Sydney to Oslo with layovers in Tokyo and London (longest individual flight 14 hours). We just plan to arrive mid afternoon and not go to bed until a normal (possibly a little early) time. So my ideal combination is to land around 2:30pm and go to bed around 10:00pm.
We often feel tired depending on how much sleep we got on the plane, but never anything that would stop us enjoying our holiday from Day 1. After a good shower and a night's sleep we are ready to go.
Is there something about American airlines or direction of travel that makes the flights more arduous than from Australia?
From Australia to get to Europe we usually travel from east to west, but on our last trip we flew west to east from Tokyo over Alaska to avoid a typhoon. Neither of us (59 and 72) felt anything other than a bit tired ... and grumpy when we got to Oslo and our train to Lillehammer for night 1 had been replaced with a bus. So all up initial journey time door-to-door was 45 hours.