To the ATC question, one experience. I was flying a Falcon 10 into KIAD one afternoon, level in the mid-teens, indicated 300-ish, when the ATCO vectored us off the airway for overtaking traffic. Now, in 1980, the DA-10 was considered pretty hot stuff for biz jets. We asked for an increase in speed and offered 400 KIAS or better. We took the vector, to watch the Speedbird speed by. As magnificent as pictures are, in flight a couple of miles away it is stunning.
GF