26 U.S.C. § 4281. Small aircraft on nonestablished lines

1. (a)
   (a)

   In general

   The taxes imposed by sections 4261 and 4271 shall not apply to transportation by an aircraft having a maximum certificated takeoff weight of 6,000 pounds or less, except when such aircraft is operated on an established line or when such aircraft is a jet aircraft.
2. (b)
   (b)

   Maximum certificated takeoff weight

   For purposes of this section, the term “maximum certificated takeoff weight” means the maximum such weight contained in the type certificate or airworthiness certificate.
3. (c)
   (c)

   Sightseeing

   For purposes of this section, an aircraft shall not be considered as operated on an established line at any time during which such aircraft is being operated on a flight the sole purpose of which is sightseeing.
4. (d)
   (d)

   Jet aircraft

   For purposes of this section, the term “jet aircraft” shall not include any aircraft which is a rotorcraft or propeller aircraft.