When beer has been laden on board the aircraft for use as supplies, the customs officer shall execute his certificate on both copies of the Form 1582-B (5130.6) or Form 1689 (5130.12), as the case may be, forward the original to the appropriate TTB officer designated on the form, and retain the copy for his files.
27 C.F.R. § 28.282
46 Stat. 690, as amended, 72 Stat. 1334, 1335; 19 U.S.C. 1309 , 26 U.S.C. 5053 , 5055