39 U.S.C. § 3663
Appellate review
A person, including the Postal Service, adversely affected or aggrieved by a final order or decision of the Postal Regulatory Commission may, within 30 days after such order or decision becomes final, institute proceedings for review thereof by filing a petition in the United States Court of Appeals for the District of Columbia. The court shall review the order or decision in accordance with section 706 of title 5 , and chapter 158 and section 2112 of title 28 , on the basis of the record before the Commission.
(Added Pub. L. 109–435, title II, § 205 , Dec. 20, 2006 , 120 Stat. 3217 .)