Space Shuttle Solid Rocket Booster design or replacing them altogether with liquid "flyback" boosters using either Atlas V or Delta IV EELV technologies. The 5-segment SRB, which would have required little change to the current shuttle infrastructure, would have allowed the space shuttle to carry an additional of payload in an International Space Station-inclination orbit, eliminate the dangerous "Return-to-Launch Site" (RTLS) and "Trans-Oceanic Abort" (TAL) modes, and, by using a so-called "dog-leg maneuver", fly south-to-north polar orbiting flights from Kennedy Space Center. After the destruction of "Columbia", NASA shelved the five-segment SRB for the Shuttle Program, and the three surviving Orbiters, "Discovery", "Atlantis", and "Endeavour"
Teacher in Space Project teachers into space. The new Teachers in Space program began in 2005. In March 2005, Teacher in Space candidate Pam Leestma, a second-grade teacher and cousin of Space Shuttle astronaut David Leestma, completed a training flight aboard a MiG-21 operated by X-Rocket, LLC. Armadillo Aerospace, Masten Space Systems, PlanetSpace, Rocketplane Limited, Inc., and XCOR Aerospace pledged flights to the new Teachers in Space project. Advisors to the new Teachers in Space project include SpaceShipOne builder and Ansari X-Prize winner Burt Rutan, X-Prize founder Peter Diamandis, Apollo astronaut Buzz Aldrin, and private astronaut and X-Prize sponsor Anousheh Ansari. The United States