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ENDNOTES <br />1. "Fortune 500 & Business Aircraft" in Business Flying. <br />National Business Aircraft Association, Inc. 1985. <br />2. Data was collected in a survey of the 1709 members of the <br />National Businessmen Aircraft Association. <br />3. Series is inverted in computing index; i.e., a decrease in <br />the series is considered upward movement. <br />