found: United Airlines WWW Home page, Mar 13, 2000(July 1, 1927 Boeing Air Transport (BAT) starts commercial air service between Chicago and San Francisco; B.A.T.; Oct. 30, 1928 Boeing Airplane -Transport Corp (BATC) inc. in Delaware and acquires BAT and other companies as subsidiaries; Feb. 1, 1929 BATC changes its name to United Aircraft-Transport Corp.; Mar. 28, 1931 United Air Lines, Inc. (UAL) is inc. as a management corp. to coordinate operations of UATC airline subsidiaries; July 20, 1934 UAL and its subsidiaries are dissolved following merger into United Air Lines Transport Corporation)
