Originally Posted by
findark
DL898 LAX DL428 is Z4 Z3 married, but DL428 alone is Z1. The website seems to show "First available with Upgrade Certificate" if there is at least one seat available, regardless of the search query.
Notably DL501 LAX DL428 is Z0 on both segments but the website shows available on LAX-LIH.
I think it is showing separate inventory availability for one pax.
We are on DL501 LAX DL428 - so the system shows Z0 married? Would it be different if we were on DL898 as the outbound, from a married segment logic standpoint (Z3 Z4)? Like, would that itin clear at booking?