Originally Posted by DataPlumber
Correct. If it is 3 class equipment you can be seated in a F seat but the catering and service is J. It's still a GREAT experience! ^
The FAs even draw the curtains between F and J, despite it being all-J. Generally the F section is reserved for Diamonds, but others get in for various reasons (as this trip report shows). Also less than half the flights operate using 3-class equipment so sometimes it is all-J. The flight is long enough to make the F seat worthwhile.