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AAPO (Apollo Applications Project for Orbiter) is an add-on for Orbiter Space Flight Simulator 2010, created to balance a historically accurate simulation of the Apollo spacecraft in Orbiter with accessibility and ease of play. In addition to the historical missions and spacecraft AAPO also models the canceled Apollo missions as well as assorted follow-on missions and spacecraft from the 1968 Apollo Hardware Applications Program.
- Apollo Application Project (AAPO): Alpha Release #2, released 16 May 2013 by Hlynkacg.
- Aapo, released 19 December 2015 by Ond.
- AAPO Patch, released 25 December 2017 by toto76math.
- AAPO Patch v2, released 20 August 2018 by toto76math.