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"Usually, planes approaching an airport drop altitude in steps, cranking up the engines to level out in between. That makes it easier for pilots to control descents and for air traffic controllers to keep track of everyone and manage spacing between planes. ** Crews check in with the ground at each interval, making sure they’re clear to drop a few thousand more feet. ** It’s a safe but inefficient way to get lots of planes on the ground."
Crews check in with the ground while still miles away from the airport. That'll be news to flight crews and ground controllers alike.