Originally Posted by christep
I think you might struggle to get the SYD-HKG-SIN-LHR bit ticketed - in any case both HKG and SIN would have to be transits, so I'm not quite clear why you would want to do this.
1. I'm mad
2. 2374 miles
If they would allow 2 transits on the same day it can be done. Night flight out of SYD - HKG and HKG - SIN during the day night flight from SIN - LHR