Used to work at JQF...

There are team planes and owner planes, and some driver planes. The ones based out of JQF are:

Stewart-Haas: 2x CRJ-200
Joe Gibbs Racing/Hendricks: 3x Saab 2000's (each)
Penske: At least one CRJ -200
Robby Gordons team: Saab 340
A few more...

Smaller teams go in together and currently charter 2 Miami Air 737's. RCR has an EMB-120 for his team out of EXX (Lexington, NC). And as previously stated, Roush has 2x 727's based at CLT. The above mentioned are the planes that the crew members ride on, of course the owners and drivers have much swankier jets (gulfstream, citation, falcon, beech, etc). Obviously if you want any chance working for NASCAR its best to go to the Charlotte area and network like crazy. Good luck!