A: Military aircraft do not practice or train over populated areas, Jim Weslowski, spokesman for Dobbins Air Force Base, told Q&A on the News. "What they are seeing are the ice crystals coming off the wings and the tails (also known as condensation trails or contrails)," he said. "They may sit up there for half hour to five hours later. They just made ice crystals when they went through the clouds. And that's a common occurrence." As temperatures drop, the contrails created by large airplanes are larger, and they appear closer to the ground, he said.
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