Altair is the brightest star in the constellation of Aquila (the Eagle). It lies at a distance of approximately 16 light years from Earth, and its color is pale yellow.
The scientific community is very interested in Altair, as it is one the locations from which radio signals were received that have not yet been scientifically explained. (The signals were first received on February 17, 1990 by a Ukranian astronomer).
Altair plays a part in the Humanoid Galactic History. Its "civilization was colonized from Vega. The Altair civilization is quiet and contemplative, given the peaceful philosophic orientation. They are not currently involved in space exploration." (PoL)
Other sources, however, attribute it a more active role: According to Chuck Roberts and several other UFO related sources, the Altair system (also?) has reptilian inhabitants (lizzies) from the Draconian Empire. This is in line with ancient Earth teachings that also associate the Altair system with reptilians.
More information: Altair must have played an important part in Egypt, too: just as the three pyramids in Giza represent the three stars in the belt of Orion, so does the pyramid of Esna represent Altair.