Originally Posted by
4runner
40-65 is typical widebody flight time in the US. This has a lot to do with regulations. Time zones and circadian rhythms, hotels, etc. there’s a reason for the regulations.
There is no "widebody" regulation.
ACMI carriers which do a great deal of international widebody flying, are completely cut out of 14 CFR 117, which is the only regulation to address circadian rhythm.
What is magic about a widebody which fatigues more than flying on another aircraft?