DENVER (CBS4) – United Airlines is considering moving its training center out of Denver.

The company uses flight simulators to train its pilots in the Stapleton neighborhood. The facility, at East 32nd Avenue and South Quebec Street, has been there since the 1950’s.

The airline said its 12,000 pilots use the facilities every nine months.

Now United is considering consolidating its three training centers, located in Denver, Houston and Chicago.