19 CFR § 122.43 - General declaration.
(b) Exception. Aircraft arriving directly from Canada on a flight beginning in Canada and ending in the U.S. need not file a general declaration to enter. Instead, an air cargo manifest (see § 122.48) may be filed in place of the general declaration, regardless of whether cargo is on board. The air cargo manifest shall state the following:
I certify to the best of my knowledge and belief that this manifest contains an exact and true account of all cargo on board this aircraft.
(c) Form. The general declaration shall be on Customs Form 7507 or on a privately printed form prepared under § 122.5. The form shall contain all required information, unless the information is given in some other manner under subpart E of this part.