n2 The date of perfection of a security interest in aircraft generally is held to coincide with the date that the security interest is filed for recordation. In re Gelking, 754 F.2d 778, 780 (8th Cir.), cert. denied, 473 U.S. 906, 105 S. Ct. 3529, 87 L. Ed. 2d 653 (1985).