Looks functional from where I sit. Response time was normal.
They keep changing the front end and I presume revising what's stored in the session cookies, so you might need to reset the cookies. You might try clicking "Clear/Remove Map Settings".
Yes. I got in the habit of observing the normal number on weekdays in daylight and weekends. But never bothered noting the number flying in the dark hours, since it was never very many. (OF course, we know they sometimes fly without transponding their location for us.) Night time typical about 23?
I expect we're going to see continued air activity as the border thing progresses.
Make Planefagging Fun Again!