NATIONAL AIRLINES, Inc., Petitioner, v. CIVIL AERONAUTICS BOARD, Respondent, Delta Airlines, Inc., Eastern Air Lines, Inc., Braniff Airways, Inc., City of Dallas, Texas, and Dallas Chamber of Commerce, Intervenors. No. 13814.United States Court of Appeals, District of Columbia Circuit.Argued June 7, 1957. Decided July 3, 1957. Mr. John W. Cross, Washington, D.C., with whom Messrs. […]