An Indian Air Force Cheetal, a derivative of the indigenously designed Cheetah with a new engine and systems, piloted by HALs test pilot Group Captain A. S. Butola and Squadron Leader S.Sharma landed at Saser Kangri Massif in eastern Ladhak region at a density altitude of 25,150 feet or 7670 metres above mean sea level at 8.45 AM setting a world record of high altitude landing! Highly rarified atmosphere, strong winds and glare of blazing sun did not deter the Cheetal and its crew in executing a safe landing at this altitude for the first time in the history of aviation.
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http://www.protonriver.com/library/air/cheetal.php