Denver International Airport officials have announced a plan that would bring a rail station and remake the Great Hall under the tent. The downsides? It will cost $1 billion, and the Great Hall would be off limits to everyone but ticketed passengers, writes The Denver Post. Currently, visitors to the airport’s Jeppesen terminal wait for arriving family and friends at a fountain and are able to dine and shop in the Great Hall. Airport revenues would pay for the plan, which would have to be approved by Denver’s city council. The area south of the terminal would also get a Westin Hotel and an open-air plaza above the rail station, reports Aviation News Today.