Conquest of the skies : a history of commercial aviation in America / Carl Solberg. Solberg, Carl, 1915- Aeronautics, Commercial United States History. HE9803.A3 S64 387.7 SOL Includes index. Bibliography: p. [417]-431. Boston : Little, Brown, c1979. c1979. 1979 Text vi, 441 p. : eng United States