Originally Posted by
jasp25
I noticed something I've never seen before on my mobile boarding pass.
It says "seq" and followed by a number, I assume it is "sequence".. But what exactly does that mean???
It's always been there before

.
It is the check-in count. #1 will be the first person that has checked in, etc. It does not dictate upgrade order (except when they have to use a tie breaker and see who checked in first).