Southwest Airlines

It was my first time to fly Southwest Airlines.
I found a non-stop flight from STL to SAN for the reasonable price.
Both flights were full due to the conference.
Online check-in was easy, but non-reserved seats did not seem fair.
Although it was fortunate for me to find the aisle seat, not everyone could check-in exact on 24 hours advance.
Snacks and drinks are decent, and I would rate Southwest Airlines as B.