 The Board's authority extends to all Executive agencies other than the Department of Defense, the National Aeronautics and Space Administration, the United States Postal Service, the Postal Rate Commission, the Federal Aviation Administration ((d)(4)), and the Tennessee Valley Authority.Its original jurisdiction over claims involving Government contract disputes partially overlaps as concurrent jurisdiction with the United States Court of Federal Claims under the Contract Disputes Act of 1978, and the "Big" Tucker Act (), but not the United States district courts for claims less than $10,000 under the "Little" Tucker Act ((a)(2)).The United States Court of Appeals for the Federal Circuit may exercise appellate jurisdiction over decisions of the Board involving Government contract disputes ( and (a)(1)).