因為安全問題.夜晚開門是為了緊急起飛時用.
**** WRONG, there are so-called "red-eye" flights (departing or arriving at mid-night).
但是機場是禁區範圍,有特別的管制.你無事行入去可能被捕或者驅逐.所以平時只有旅客會去機場範圍.
**** But he is really taking a flight! and, there are many "overnight passengers" there for transit in the "airside".
Please note the difference between: 禁區範圍 and 機場範圍. WHOLE CHEK LAP KOK Island is 機場範圍!