Our trip in November arrived on a Saturday. Never doing a Saturday again if I can help it. Immigration was a chaotic mess. Took at least an hour to get through immigration alone, then another 40 mins to get luggage and through the bag search. We took the 'choose your own seat' option that's a little more expensive, because the plane was a 3-3-3 formation, except for the last 6 rows that are 2-3-2. Much prefer sitting as a pair than leaving some poor fellow passenger having to share with us! Only issue with this is they unload people from the front first, so we were at the back of the queue! That was at least 280 people from our plane in front of us, plus other flights arriving too.
Only $20 each for upgrades on the charters out of STL. Sit up front and get off early, plus the free cocktails.