Join Date: Jan 2015
Location: Bregenz, Austria
Programs: AA, BAEC, Alaska, Flying Blue, United, IHG, Hilton
Posts: 2,950
The even split every time, even if the total time in the air is longer.
As a non-sleeper and heavy smoker, I find flights longer than 7 hours a serious PITA.
For my upcoming AA award flight MUC-SFO, I had the choice of transferring in LHR (2+11.5) or PHL (9+6). I chose the 9+6 and slipped in a nice little 23hr layover in Philly.
Likewise going east to eg. SIN, 7+7 via the ME is so much more tolerable than 12hrs straight through.