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"This night flying, formerly done by the Post Office Department, but now relinquished entirely to private mail transport companies, aggregates more than a million and three-quarter miles of flying in the year, and constitutes the greatest night air flying operation in the world."

In the development of aviation—especially long distance flying, and pioneer over-water efforts—meteorological study is vital. In connection with the Friendship flight I have told somewhat of how its backers cooperated in supplementing the work of the Weather Bureau with separately collected data. These efforts brought home to us all, I am sure, a vivid reali-