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SkiingAway t1_j03859e wrote

Or more locally, Montreal tried this (Mirabel).

Failed so hard that it's no longer used for passenger service at all and half of it is now used for motorsports.

Realistically, it pretty much only works if you forcibly close the old airport (Stapleton/Denver), or if the old one is so limited that it really can't meet demand even if it stays in full operation (Midway/Chicago).

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