Comair, the Erlanger-based regional airline, Monday said it had reinforced the cockpit doors on all 99 of its aircraft.

        The Federal Aviation Administration and Department of Transportation required the nation's airlines to reinforce cockpit doors after the Sept. 11 attacks.

        Comair, a wholly owned subsidiary of Delta Air Lines, took the lead for the Regional Airline Association in designing a system to reinforce the doors. The carrier owns 92 Canadair Regional Jets and seven Embraer Brasilia 120 turboprops.

        In addition, Comair began using gates at Concourse A at the Cincinnati/Northern Kentucky International Airport as of Nov. 1. Airline officials had said they would expand earlier this year, but the move was delayed by last spring's 89-day pilots strike.

        Concourse A will be used instead of Concourse C for departures to Charlottesville, Va., and Charleston, W.Va., and arrivals from Charleston and Roanoke, Va.

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