1) 757-200 is the "typical" ship for NFL charters....it can usually accommodate the team, coaches, staff, and equipment. The latter is a major determinant in A/C selection.
2) Most charter contracts are fleeted at time of signing....some long haul trips are upgraded to widebodies etc depending on team's request, airline availability, etc.
3) On average, most NFL teams haul about 12,000 lbs of stuff. Definitely bulks out the bins, and usually the team equipment managers work with the airline ramp folks in proper sorting, loading and stacking of gear to fit it all in. There are times when it needs to be trucked/expedited via ground.
4) Players usually sit in coach, with empty seats between players. Depending on # of seats and people traveling, there is surprisingly enough room for offensive lineman.
5) Many teams do assigned seating, with coaches and front office personnel being in FC, PR
folks, equipment mgr types, charter escort, etc in front of coach, players in rear.
A lot of the specific demands and stipulations depend on the NFL team in question, their "reputation" and way they deal with the airline(s), etc.
The charter landscape, at least in the NFL, has changed a lot over the past few years. NW
had 13 teams just a couple years ago, but have pulled back their NFL work sizably. CO
doesn't even bother with it much anymore.