On a sillier note, I wonder what the fastest speed you can reach is, in terms of timezones/hr.
My guess was a polar route like ANC-HEL, but there don't seem to be any direct passenger flights. Condor flies ANC-FRA seasonally, which is pretty much exactly 1 hour time difference per hour of flight. Another possibility is TAS->URC, at 1.2.
The author's routes, YVR-LHR and YVR-NRT, are both 0.8-0.9 hours difference per hour flight time, depending on direction.