Sightseeing flights within 25sm of an airport in airplanes and helicopters are conducted under 91.147 and 119.1(2)

Does anyone know what regulation(s) control sightseeing flights in gliders?

thanks, bob

http://www.law.cornell.edu/cfr/text/14/91.147
http://www.law.cornell.edu/cfr/text/14/119.1