range is important in regular flight schedules, since it means that on the average i I l i t [ Chicago io Davenporf in a region where the wind is prevailingly 20 3300 ft. ' south, for example, flights northward can be 10 made to best advantage at night or in the O early morning, and those southward… … <lo< toUjffj (ostn 5sS shows a decrease. In the southern section of Wind direction the airway wind velocities during summer Fig. 6.—Frequency of different wind directions at 1,600 and 3,300 show, on the average, little change at all feet along certain sections of the Chicago-Dallas Airvvaj- levels…
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