Technical improvements in aircraft and navigational and airport aids have eliminated most of the problems of adverse weather which the air transportation industry faced 30 years ago. In spite of this progress, nature is still capable of setting up hostile environments for aircraft operations. Such elements as thunderstorms, fog, turbulence, snowstorms, heavy rain, and high winds can close airports, divert flights and cause disservice to passengers. Using typical cases, the full effects of weather interruptions are discussed and related to the present day United States fleet of 2400 transports, and to their control. Recent economic studies provide a basis for assessing the cost of several weather factors which interfere with scheduled air transportation.

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1 Presented at AMS 51st Annual Meeting, San Calif., 12 January 1971.