United Airlines has filed a master plan with the City of Denver, indicating potential plans to build over 1 million square feet of office space.

The intriguing element is that in its infrastructure plan, United Airlines outlined the potential to develop five office buildings, at least two parking structures and common space for uses like a food hall, meeting rooms, fitness center and a 50,000-square-foot conference center. United spokesperson Pat Mullane told WGN Investigates:

FOX31's Matt Mauro breaks down a new filing with the city of Denver that could signal a big move for United Airline's headquarters.