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kuyakev
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The FAA (Federal Aviation Administration) mandates that all airborne aircraft be separated by at least 4nm, and in the case of some classes of aircraft, 5 or 6nm. Even in parallel landings, both approaching aircraft will be at least 4nm apart. Parallel landings are useful to allow for more traffic to land, especially when multiple aircraft are on the ground taxiing to and from the runways. For instance, aircraft #1 may be just exiting the end of the runway onto the taxiway while aircraft #2 is landing on a parallel runway. Normally, if both aircraft #1 and aircraft #2 were landing on the same runway, the clearance for aircraft #2 would be revoked if #1 was still in process of exiting the runway. So therefore the purpose of parallel landings is to utilize the minimum safe space (four miles) between aircraft and to allow maximum landings at busy airports. If only one runway is functioning for landings, then the distance will be greater to allow each plane time to exit.
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