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<br />disruptive fogs in the United States. A study of 21 c.ivilian airpor1:S showed <br />that 11 had over 500 arrivals affected by warm fogs, and four airports had <br />over 1000 arrivals affected: the cost was estimated at $3,000 per incident. <br />!he Air Transport Association estimated that elimination ofsdelays due to warm <br />fogs would result in savings of $75 million at 1971 prices. <br /> <br />- 12 - <br />