"Morgans" wrote in message
...

How many transmissions per hour would be involved for an airliner cruising
at altitude, and how many would be required for one that is landing and
taking off again, and also how many different people are involved for one
taking off and landing?


Location, location, location. An airliner cruising at altitude may have to
be placed in sequence hundreds of miles from the destination. A short
hauler might be doing a visual approach to a nontowered field.

What constitutes an "ATC service" in your mind?