When the Civil Aeronautics Board regulated the air industry by setting airline rates and conferring air routes on various cities, most of those appearing at its hearings were

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The question asks who appeared at the Civil Aeronautics Board hearings when it regulated the air industry. The correct answer would be airline companies since they were the ones affected by the board's decisions regarding rates and routes. Passenger representatives, government officials, members of the public, and airport employees may have had some interest in the decisions made, but they would not have been the main players at the hearings.

When the Civil Aeronautics Board Regulated the Air Industry by Setting