Originally Posted by
pinniped
TATL seems to fit nicely for turning the plane around and sending it back. That is, 7-8 hours in the air each way makes it possible for the plane to do a round trip each day. Overnight east, daytime west, rinse, repeat.
Actually that is far from optimal, at least from the east coast. UA typically sends its TATL 752s someplace else after a TATL arrival into EWR. Florida is a typical destination. 777s are cycled with other destinations.
OTOH flights like IAH-LHR and ORD-FRA r/t are almost perfect. A r/t is just under 24 hours (18-20 hours flight time), with enough padding for turns and delays. You can see UA use the same 777 on IAH-LHR-IAH for days on end.