No person shall for compensation sell or offer for sale transportation subject to this chapter or shall make any contract, agreement, or arrangement to provide, procure, furnish, or arrange for such transportation or shall hold himself or itself out by advertisement, solicitation, or otherwise as one who sells, provides, procures, contracts, or arranges for such transportation, unless such person holds a broker’s license issued by the Commission to engage in such transactions; provided that the provisions of this section shall not apply to any carrier holding a certificate or permit under the provisions of this chapter or to any bona fide employee or agent of such carrier so far as concerns transportation to be furnished wholly by such carrier or jointly with other air carriers holding like certificates or permits, or with a common carrier by railroad, motor vehicle, express or water; nor shall they apply to any air carrier not engaged in intrastate operations or to any bona fide employee of such carrier.