and lowest cost suborbital personal spaceflight launches, using the vertical takeoff and horizontal landing Dream Chaser vehicle based on the NASA HL-20 Personnel Launch System vehicle. Excalibur Almaz had plans in 2007 to launch a modernized TKS Spacecraft (for Almaz space station), for tourism and other uses. It was to feature the largest window ever on a spacecraft. Their equipment was never launched, and their hangar facility closed in 2016. It is to be converted into an educational exhibit. Escape Dynamics operated from 2010 to 2015, with the goal of making single-stage to orbit spaceplanes. In December 2012, the Golden Spike Company announced plans to privately transport space exploration participants to the surface of the Moon and return, beginning as early as 2020, for US$750 million per passenger. XCOR Aerospace planned to initiate a suborbital commercial spaceflight service with the Lynx rocketplane in 2016 or 2017 at $95,000. The first flights, to be taken by 23 passengers from the Axe Apollo Space Academy, were planned for 2015. Private space stations By 2010, Bigelow Aerospace was developing the Next-Generation Commercial Space Station, a private orbital space complex. The space station was to have been constructed of both Sundancer and B330 expandable modules as well as a central docking node, propulsion, solar arrays, and attached crew capsules. Initial launch of space station components was planned for 2014, with portions of the station projected to be available for leased use as early as 2015. , no launches have taken place. Lunar private ventures Robotic Lunar-surface missions The following companies and organizations had made initial funded launch commitments for Google Lunar X Prize-related Lunar launches in 2016: Moon Express SpaceIL Synergy Moon Team Indus Hakuto (ispace) Private Lunar-surface crewed expeditions Shackleton Energy Company intends to undertake human tended lunar prospecting for water ice. If significant reserves of ice are located, they plan to establish a network of "refueling service stations" in low Earth orbit and on the Moon to process and provide fuel and consumables for commercial and government customers. If the prospecting is successful—ice deposits are located, the appropriate legal regime is in place to support commercial development, and the ice can be extracted — Shackleton proposes to establish a fuel-processing operation on the lunar surface and in propellant depots in Low Earth Orbit. Equipment would melt the ice and purify the water, "electrolyze the water into gaseous hydrogen and oxygen, and then