LOL they dnt
They seem to make a buzzing sound, which is why aeroplanes are said to sometimes "buzz the airfield".
Why wouldn't they? Of course they do. However, they might try to make less noise than usual, or stay away from residential areas, at night.
soe can but not very often.
In current use - no one. But the Concorde and its Russian counterpart were faster than the speed of sound.
Much less than they do now
Sound is often louder at night because there is less ambient noise and activity, allowing sound waves to travel further without interference. This can make sounds seem louder and more noticeable in the quiet of the night.
Because of their lights on the wings and cabin.
They can land there at any time, day or night.
The collective nouns for aeroplanes are a flight of aeroplanes or a squadron of aeroplanes.
A speed can't be louder or less loud. The sound itself can be louder; or the speed can be faster.
Things may sound louder at night due to the decrease in ambient noise levels. With fewer sounds competing for attention, noises that may have been less noticeable during the day can seem louder in the quiet of the night.
aeroplanes can reverse