49 U.S.C. § 46309

(a) Criminal Penalty for Offering, Granting, Giving, or Helping To Obtain Concessions and Lower Prices .— An air carrier, foreign air carrier, ticket agent, or officer, agent, or employee of an air carrier, foreign air carrier, or ticket agent shall be fined under title 18 if the air carrier, foreign air carrier, ticket agent, officer, agent, or employee— (1) knowingly and willfully offers, grants, or gives, or causes to be offered, granted, or given, a rebate or other concession in violation of this part; or (2) by any means knowingly and willfully assists, or willingly allows, a person to obtain transportation or services subject to this part at less than the price lawfully in effect. (b) Criminal Penalty for Receiving Rebates, Privileges, and Facilities .— A person shall be fined under title 18 if the person by any means— (1) knowingly and willfully solicits, accepts, or receives a rebate of a part of a price lawfully in effect for the foreign air transportation of property, or a service related to the foreign air transportation; or (2) knowingly solicits, accepts, or receives a privilege or facility related to a matter the Secretary of Transportation requires be specified in a currently effective tariff applicable to the foreign air transportation of property.