Is there a Mileage Plan building or Reservations office located in Denver? Site looks good, but doesn't note what positions are In Denver. The job would be for my girl when we move to Denver after we're done with school in the next 2 years. Frontier looked good, but they have an all Airbus fleet, here in Seattle, Boeing is a great source of industry. I just can't find another airline that has a Milage Plan, Reservations, or Customer Care building in Denver. It looks like United has their HQ in Chicago, but I can't tell if they have any offices in Denver.