Compared with the current space shuttle, aircraft, and launch vehicle, the near space vehicles have some advantages such as low transport costs, quickly arrived and can be reused.

相对目前的航天飞机、飞机和运载火箭，临近空间飞行器具有运输费用低、可快速到达和可重复使用等优点。

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But like all hot tickets, the autumn migration can come with its share of hassles, including sky-high prices and traffic jams as safari vehicles jostle for space near the best sightings.

BBC: The Serengeti in the off-season