Members of the news media begin to gather near the countdown clock at NASA’s Kennedy Space Center in Florida to await liftoff of the SpaceX Falcon Heavy rocket, seen in the background at Launch Complex 39A. The demonstration flight will be a significant milestone for the world's premier multi-user spaceport. In 2014, NASA signed a property agreement with SpaceX for the use and operation of the center's pad 39A, where the company has launched Falcon 9 rockets and is preparing for the first Falcon Heavy. NASA also has Space Act Agreements in place with partners, such as SpaceX, to provide services needed to process and launch rockets and spacecraft.