事发空域是一个非常繁忙的通用航空走廊，天气晴好的时候那里的观光飞机络绎不绝。
The accident happened in a busy general aviation corridor over the river that is often filled with sightseeing craft on sunny days.
天气晴好的时候，他偶尔地会出去一下，可能出去四五个钟头，在11点到4点之间。
Once in a while he would go out, in fine weather, it might be four or five hours, between eleven and four.
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