Congestion at airports is absolutely the airlines problems. The airlines are guilty of "bunching" which puts large numbers of flights together at peak times. This scheduling is done for the convenience of the airlines, to make their "hub"systems work. The FAA attempted to address this problem in the NYC area airports and the airlines actually sued the government to block their efforts to regulate scheduling. It is absolutely not the case that this congestion is caused by ATC. This problem is firmly rooted in the airlines.
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