I've figured out Johns route home..
San Fran to LA, LA to Syd, they Syd to Perth..
Now which SYD flight is he on is the question assuming his flying business class Quantas:
TWO CHOICES: (perth time via sydney)
QF571 Sydney 19:50 19:50 Estimated
OR
QF583 Sydney 21:10 21:10 Estimated
:)
hu$h