19 C.F.R. § 122.71
(a) Application. This section applies to aircraft departing for foreign territory with no export cargo, but not to those aircraft which are themselves being exported.
(1) Such aircraft may clear by telephone in advance with the director of the port of departure if departing empty or carrying only:
(2) If not cleared by telephone, an air cargo manifest containing the following statement, signed by the aircraft commander or agent, must be submitted to CBP:
I declare to the best of my knowledge and belief that there is no cargo on board this aircraft. Signature (Aircraft Commander or Agent)
[T.D. 88-12, 53 FR 9292, Mar. 22, 1988, as amended by CBP Dec. 17-06, 82 FR 32238, July 13, 2017]