B A R R Y writes:

All answers to follow are USA based.

Good.

On approach and departure in busy airspace, they can be common.
Straight and level or quiet airspace, not so common. For fast
aircraft, there are speed limits below 10,000 feet and near class B &
C airports. I'm usually told to keep my speed up in the spam cans I
fly. G

What is a spam can? A small aircraft?

Usually on initial contact, when new weather information is issued, or
as a subtle reminder when you're not maintaining the altitude you are
expected to be at. G Before they yell at you for drifting, most
controllers will remind you of the current local altimeter setting.

You have so much interest in this, you have got to get up in the real
thing...

Not possible or practical at this time, I'm afraid.

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