By the way - lest folks really think they are about to fall out of the sky with empty tanks - these preplanned diversions generally come from legal requirements. These are conservative and smart requirements so not suggesting they shouldn't be there. But to actually understand why a diversion occurs, particularly in an ETOPS situation you'd need to look at the legal calculations rather than how much fuel is in the tank when you land. Mainland to Hawaii is one of the most difficult ETOPS spans in the world since there are no places to divert over that stretch at all and no routing that would make the diversion envelopes smaller. Furthermore, if you do take an engine failure you will be flying at a much lower (read much less fuel efficient) altitude. Put all that together with the legal requirements and you get what you see here. The rules are there to make sure things come out ok even when lots of stuff goes wrong (winds stronger, halfway out an engine fails, etc.). As for me - I'll take the fuel diversion rather than the "swimming" part of Engines Turning Or Passengers Swimming (ETOPS).