Clearance frequency

So I have been doing a bit of research on air traffic control and because of that I found something that infinite flight is missing. The clearance frequency. What is it? It is a frequency that clears planes for pushback something that the ground already has control over. I thought this would be a good addition to infinite flight and make it a step closer to the real world!

Please search before posting. There is already a topic for this, and multiple will clog the forum up. Vote here:

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Ok I forgot to search I will remember any mod can close this topic

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Just voted on the other topic