Any claimant, or any railway labor organization organized in accordance with the provisions of the Railway Labor Act [
45 U.S.C.
151 et seq.], of which claimant is a member, or any base-year employer of the claimant, or any other party aggrieved by a final decision under subsection (c) of this section, may, only after all administrative remedies within the Board will have been availed of and exhausted, obtain a review of any final decision of the Board by filing a petition for review within ninety days after the mailing of notice of such decision to the claimant or other party, or within such further time as the Board may allow, in the United States court of appeals for the circuit in which the claimant or other party resides or will have had his principal place of business or principal executive office, or in the United States Court of Appeals for the Seventh Circuit or in the United States Court of Appeals for the District of Columbia. A copy of such petition, together with initial process, shall forth-with be served upon the Board or any officer designated by it for such purpose. A copy of such petition also shall forthwith be served upon any other properly interested party, and such party shall be a party to the review proceeding. Service may be made upon the Board by registered mail addressed to the Chairman. Within thirty days after receipt of service, or within such additional time as the court may allow, the Board shall file with the court in which such petition has been filed the record upon which the findings and decision complained of are based, as provided in section
2112 of title
28. Upon the filing of such petition the court shall have exclusive jurisdiction of the proceeding and of the question determined therein. It shall have power to enter a decree affirming, modifying, or reversing the decision of the Board, with or without remanding the cause for rehearing. The findings of the Board as to the facts, if supported by evidence and in the absence of fraud, shall be conclusive. No additional evidence shall be received by the court but the court may order additional evidence to be taken before the Board, and the Board may, after hearing such additional evidence, modify its findings of fact and conclusions and file such additional or modified findings and conclusions with the court, and the Board shall file with the court the additional record. The judgment and decree of the court shall be final, subject to review as in equity cases.
An applicant for review of a final decision of the Board concerning a claim for benefits shall not be liable for costs, including costs of service, or costs of printing records, except that costs may be assessed by the court against such applicant if the court determines that the proceedings for such review have been instituted or continued without reasonable ground.