As part of a nationwide revamping of the air-traffic system, the Federal Aviation Administration has proposed changing air corridors in and out of Phoenix Sky Harbor Airport, the Valley's main airport and the sixth busiest airport in the nation. The officials are attempting to untangle crowded airspace about 200 miles northeast and northwest of the city.

Because such a large portion of the state's airspace is restricted to military flights, public flights are relegated to a small number of corridors in and out of Sky Harbor Airport. Some of those routes intersect near the cities of St. Johns, a rural town about 200 miles northeast of Phoenix, and Kingman, a rural city about 200 miles northwest of Phoenix.

By converting some of the current departure routes into arrival routes and vice versa, and by eliminating some routes altogether, the FAA hopes to reduce the aerial clutter.

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