A、They were thrown into financial difficulties. B、They thought it was dangerous to fly long distance. C、They feared to be involv

Juan Trippe was one of the pioneers of modern air travel. His company—Pan American Airways—was one of the first to offer cheap air travel round the world. Trippe was born in New Jersey in 1899. After graduating from Yale in 1921, he worked first on Wall Street and then as a pilot. From 1924 to 1926 he worked for Colonial Air Transport, and founded Pan American Airways the following year.
    At first, Pan American offered flights across the Caribbean and South America. This was so successful that Trippe started to offer flights to Asia eight years later. At the end of the thirties he introduced the first transatlantic flights. Immediately after the Second World War, Trippe decided to offer cheap transatlantic flights.(31)Other airlines objected— they wanted to keep prices high, and earn maximum profits. For several years, many airports in Europe refused to accept Pan American flights. The other airlines only finally agreed to offer economy flights in 1952.
    Trippe started on his next project the same year—the development of the jet engine. This would make it possible for planes to fly longer distances at higher speeds.
    In the sixties, Trippe commissioned Boeing to build a jet, which could carry more passengers. This was the 747. Unfor tunately, Trippe ordered too many 747s and put Ban American into financial difficulties. In 1968 he resigned from the company. Thirteen years later he died.
30. Q: What do we learn about Juan Trippe?
31. Q: Why did other companies object transatlantic flights?
32. Q: What benefit can jet engine bring to the air travel industry?