r that Congress either explicitly or implicitly delegated authority to cure that ambiguity. Am. Bar Ass’n v. FTC, 430 F.3d 457, 469 (D.C. Cir. 2005); Motion Picture Ass’n of America, Inc. v. FCC, 309 F. 3d 796, 801 (D.C. Cir. 2002) (“MPAA ’’) (“agency’s interpretation of [a] statute is not entitled to deference absent a delegation of a