A copy of each contract filed pursuant to § 302.718, and a copy of all material and data filed pursuant to § 302.719, shall be served upon each of the following persons:

(a) Each certificated and commuter (as defined in § 298.2 of this chapter) air carrier, other than the contracting carrier, that is actually providing scheduled mail services between any pair of points between which mail is to be transported pursuant to the contract; and

(b) The Assistant General Counsel, Transportation Division, U.S. Postal Service, Washington, DC 20260-1124.