United Space Alliance is floating a proposal to continue flying space shuttles after NASA retires the three shuttle fleet. USA says it would fly two shuttle missions a year for $1.5 billion-- far less than such flights would cost NASA-- until other commercial options are available. Currently, the only access NASA astronauts will have to ISS between the shuttle's retirement and the debut of commercial ships will involve hitching rides on Russian Soyuz capsules.
USA acknowledges the plan is a long shot, but it says it is ready to pursue the project if NASA and other potential customers for the unique service show sufficient interest.
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