Have our first EY flights on SIN-AUH-LHR booked in the spring with both segments on J currently booked via AA. There's F availability now for two on the SIN-AUH flight and I was curious if it's worth the 15k a seat to upgrade to F from J on the 789.

While I'm keeping an eye out for AUH-LHR to open in F, I'm not holding my breath due to the tighter availability on that route plus all the equipment changes that have been happening.

Thanks for any input!