Category I: Skydiving operations that use military aircraft which fall under DOD regulations.
Category II: Skydiving operations that operate routinely with not more than two small aircraft, each with a maximum takeoff weight of less than 6,000 lbs; or professional skydiving and canopy schools that are located at and use aircraft of a current established USPA Group Member.
Category III: Skydiving operations that routinely use more than two small aircraft or one large aircraft, with a maximum takeoff weight of 6,000 lbs. or more; or wind tunnels.