Hawaii Administrative Rules Title 18 — Department of Taxation
HAR § 18-235-38-06 — Apportionment of income for special industries
The director finds that neither the apportionment formula of section 235-29, HRS, nor the separate accounting method clearly or accurately reflects the correct taxable income in Hawaii of taxpayers doing business within and without Hawaii in the industries listed in the following table. Accordingly, income of these taxpayers shall be apportioned using the methods in the section listed opposite the name of the industry in the following table. Special industry Section Air carriers
Source: official text