Originally Posted by
SolanaBeach
If you are on DL2340 out of SFO Expertflyer is showing 0 inventory for upgrades (X or Z)
Of course, that could change, so YMMV and good luck!
Those flights never show X/Z space, and it won't change.
I know, never say never, but the vast, vast majority of the LAX/SFO-JFK flights will not have inventory for upgrades prior to the gate. These flights are unique, since they have BE service.