A friend is currently booked in J from LAX-JFK next month on QF 107. His last two upgrade credits expire at end of Aug, so I think it's a no brainer to waitlist for an upgrade to F on this sector. Has anyone flown this sector in F? Is it worthwhile to use the credits this way? His only other options for using them would be twice from Y->J on MEL-ADL or MEL-SYD - personally I think a waste of time on such short sectors.