14 C.F.R. § 16.221 Witness fees.
Title 14 - Aeronautics and Space
(a) The party on whose behalf a witness appears is responsible for paying any witness fees and mileage expenses. (b) Except for employees of the United States summoned to testify as to matters related to their public employment, witnesses summoned by subpoena shall be paid the same fees and mileage expenses as are paid to a witness in a court of the United States in comparable circumstances.
Title 14: Aeronautics and Space
PART 16—RULES OF PRACTICE FOR FEDERALLY-ASSISTED AIRPORT ENFORCEMENT PROCEEDINGS
Subpart F—Hearings
§ 16.221 Witness fees.