commercial aviation
For purposes of this subpart, the term “commercial aviation” means any use of an aircraft in a business of transporting persons or property for compensation or hire by air, unless properly allocable to any transportation exempt from the taxes imposed by sections 4261 and 4271 by reason of section 4281 or 4282 or by reason of subsection (h) or (i) of section 4261. Such term shall not include the use of any aircraft before March 9, 2024 , if tax is imposed under section 4043 with respect to the fuel consumed in such use or if no tax is imposed on such use under section 4043 by reason of subsection (c)(5) thereof.