CHICAGO -- Denver, Indianapolis, Louisville, Ky., and Oklahoma City are finalists for a $1 billion United Airlines aircraft maintenance facility, the airline announced Friday.

The four are the finalists from a list of 90, according to Sarah Dornacker, a United spokeswoman. She added that the airline hoped to make a final decision on where to locate the facility soon.

"It's a matter of days or weeks," she said.

Competition for the facility -- expected to employ 7,000 people when completed -- has been fierce. In July, for example, the Colorado legislature approved tax incentives worth an estimated $200 million to $300 million for the airline to locate the facility in Denver. In February, Oklahoma County voters approved a temporary 1-cent sales tax that would raise $120 million to assist the airline in building the facility in Oklahoma City.

The other two finalists have kept their incentive packages under wraps.

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