Financial problems in the middle sector of U.S. airlines known as "national" carriers became evident last week as cargo operator Kitty Hawk Inc. filed for bankruptcy protection and Tower Air halted international scheduled passenger services. The two airlines until recently have been active in the National Air Carrier Assn. (NACA) of Washington, an industry group which represents eight carriers in the national category. A national airline produces annual revenues of more than $100 million but less than $1 billion.
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