See post 30.
Maximum passenger seating for a 737-400 is 188; most are configured for less if they include a business or first class section. So I used 140 seats as this is conservative, but these guys in Florida will take anywhere from 159 - 188 depending on what you want:
https://westpalmjetcharter.com/private-jets/charter-airliner/boeing-737-400/
Really nice airplanes. Should be metal seats for the SOBs, but whatever.
Too bad. If they were transports, the wetbacks could get packed on pallets, and the pilots could practice LAPES.