Not even half empty with a 747-400ER.
Only empty...and likely with extra tankage.....
and maybe not at that
While no 747 can viably operate SIN
nonstop in commercial service, your emboldened quotations are going slightly overboard fellas:
Remember that UA
used to operate JFK
with a payload restricted 744A, a route that's "only" 607nm longer.
Didn't Qantas do LHR-SYD with an empty -400 on delivery?
Indeed they did.
[Edited 2004-06-18 21:56:08]