| | Tupolev Tu-144 -- Facts, Info, and Encyclopedia article (Site not responding. Last check: ) |
 | | During the 1980s, the last two production aircraft to fly were used for airborne laboratory testing, including research into (Click link for more info and facts about ozone depletion) ozone depletion at high altitudes. |
 | | These two aircraft remain at the Tupolev production plant in (Click link for more info and facts about Zhukovski) Zhukovski, reg 77114 and 77115. |
 | | In 1990, Tupolev approached (An independent agency of the United States government responsible for aviation and spaceflight) NASA and offered a Tu-144 as a testbed for its High Speed Commercial Research program, intended to design a second-generation supersonic jetliner. |
| www.absoluteastronomy.com /encyclopedia/t/tu/tupolev_tu-144.htm (1265 words) |