Re: How does Center know?
Well, they generally know that you want to be 30 miles out at 10,000 and 250 to 320 knots.
Or they might know you have a particular crossing restriction as per your arrival and you're getting close to the 3:1 glidepath.
Remember, ATC knows your filed IFR flight plan, your planned airspeed and a little (and I do mean a little) information about the performance of your aircraft.
Speaking of that, my uncle just retired who was a supervisor at Miami Center. They have a madatory age-56 retirement!
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