Spaceport Associates provides an educational resource to those interested in the business of space tourism and commercial initiatives towards space exploration. To this end, we are proposing joint government/commercial activities to make possible a "Gateway Earth" outpost at the edge of Earth's gravity well. Space tourists would have a hotel there, with vistas of the whole Earth, and a regular taxi service from low Earth orbit using refuelable tugs. The space tourism revenues would help pay for the building and operation of the complex, which would provide a new start and end point for governmental interplanetary missions.
The following papers, and the Mini-Tutorial, provide some insight into the relevant issues.