A lot of planes isn’t it. The most common charter is a 737, each seating between 200 and 400 maximum , or close to that.
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.