Originally Posted by
ANZ787900
Not really.. I had a 15 hour LAX-HKG flight in which the tanks were completely full; yet they only just had enough to get to HKG without tapping into their emergency reserves. So I'd expect the other flights from JFK and ORD to be in a similar position where they'd end up using the whole tank apart from their reserves.
If everybody is overweight then the tank will be used up quicker, and in danger of the need for fuel stop, LAX-HKG flights from time to time had to stop in Taipei. Mostly due to ridiculously strong headwind, but weight doesn't help either.