About altitude results of 475
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04:24![Bird Migration - Texas Parks and Wildlife [Official]](https://img.youtube.com/vi/3aMb6OwmKdM/hqdefault.jpg)
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10:01![FAA NextGen Gate to Gate 新一代飛航管理系統- 門戶直達 [CC字幕]](https://img.youtube.com/vi/OZ8NNuqaaN4/hqdefault.jpg)
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