We thank Mr. Scott Lambert from the FAA Air Route Traffic Control Center in Nashua, New Hampshire, for providing access to the FAA facilities, allowing us to document aircraft observations in real time. The aircraft data obtained were invaluable to this study. We also thank Dr. Andrew Detwiler for contributing his vast knowledge of contrails, including both the production of contrails by jet aircraft and the cloud physics of contrails, to this study. The comments of Dr. Frank Ruggiero in reviewing the original manuscript are also appreciated.
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