博尔施伯格已经展示了HB - SIA的夜间飞行能力。
Mr Borschberg has already shown the aircraft can be flown through the night.
对博尔施伯格而言最大的担忧则是在夜间遭遇逆风，因为这会拉长夜间飞行时间，且有可能造成电池在日出前耗尽的风险。
Encountering a headwind at night is Mr Borschberg's biggest worry because that would make the night much longer, so he would risk running out of energy before sunrise.
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