Does Spirit flying anything smaller than an Airbus 319? If not, then it won’t go relative seniority since the fleets aren’t relatively the same. A220 and E190 are lower status/category planes. So it looks like you have 4 groups for your S&C groupings.

A-319/320/321 CA
A-220 E-190 CA
A-319/320/321 FO
A-220 E-190 FO

This will be a big driver how they integrate the seniority lists per ALPA merger policy.

And before you talk about pay rates, we tried that when we merged with United and it didn’t work.