N.J. Stat. Ann. § 54:10A-6.3

2. Notwithstanding the provisions of section 6 of P.L.1945, c.162 (C.54:10A-6), the sales fraction for the transportation revenues of a taxpayer that is an airline shall be determined as the ratio of revenue miles in this State divided by total revenue miles; provided however, that if a taxpayer that is an airline is engaged in the transportation of passengers, the transportation of freight, or the rental of aircraft, the ratio under this section shall be determined by means of an average of a passenger revenue mile fraction, freight revenue mile fraction, and rental revenue mile fraction weighted to reflect the taxpayer's relative gross receipts from passenger transportation, freight transportation, and rentals.