Colorado’s futuristic Hyperloop travel system will start with a station near Denver International Airport. But where it goes from there is still to be determined, and the project is seeking public feedback, officials said Tuesday. They also are halfway done studying how to bring a vacuum-sealed tunnel to the state that would shoot pods carrying people and cargo between Fort Collins and Pueblo at speeds of up to 670 mph. “Then there’s a remaining debate in the feasibility study that we need to work out and we need people’s views on this.