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Generally speaking, the size of a private airport is relative to the size of aircraft it serves. A small field may only have a grass strip, but be very busy. Conversely, a bigger field may not be busy at all. From an FAA air space perspective, size is defined by class and either controlled or non-controlled. The classes are A, B, C, D, G. Federal airways are Class E. Controlled air space has an operating control tower and in many places, when the control tower closes for the day, the air space class changes completely until the tower reopens the next day.
For private planes and air charters, check the chart to find out what class and airport is operating under and the protocols needed.