1. Robert Zubrin says the rocketplane would take off and land at existing airports, making [the rocketplane] much easier to use than the space shuttle which has to glide onto special landing strips.
Note, the rocketplane is being compared to the space shuttle, not to taking off and landing or to airports. 2. Rocketplanes could carry a satellite above the atmosphere where [the rocketplane] could be gently pushed into orbit, and then return to the airport to load another one.
Note, satellites cannot "return to the airport" or "load another [satellite]."