(i) In general Subject to clause (ii), beginning on the date that is 2 years after the date a final rule is published pursuant to paragraph (3), no person may conduct commercial air tours unless such person either— (I) holds a certificate identifying the person as an air carrier or commercial operator under part 119 of title 14, Code of Federal Regulations and conducts all commercial air tours under the applicable provisions of part 121 or part 135 of title 14, Code of Federal Regulations