ironbutt57
depends on the time of day. I work for a UK airline and our rules much like EK suggest a 24hr rest period isn't brilliant. That's based on the charter mentality of day time flights UK to USA, night flight back with a time zone shift thrown in.
However, i work in express packages now and we do a night / day transition to USA with a 24hr rest period. Quick sleep on arrival in USA, get up, have a nights kip on UK local, get up and fly home. 24hrs rest period - absolutely the best.
So its down to the route, times, length, TZ shifts etc and you almost have to look at every pairing