[NorthMountain]

Flight Altitude Record at Wikipedia.

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[Texas Fossil]

Thanks.

From your link: https://en.wikipedia.org/wiki/Flight_altitude_record#Gliders

The highest altitude obtained in an unpowered aircraft is 15,460 m (50,720 ft) on 30 August 2006 by Steve Fossett (pilot) and Einar Enevoldson (co-pilot) in their high performance research glider, a modified DG-500

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Most of the records have been set using lee waves to give the altitude gain. At least in the beginning. There is a famous glide port near the Air Force Academy in Colorado Springs (Black Forest). At one time the altitude record for a Schweizer 1-26 was held there.