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The International Group for Historic Aircraft Recovery (TIGHAR) is a nonprofit organization located in Delaware, USA. Founded by Richard Gillespie in 1985. TIGHAR has long been involved with the search for Amelia Earhart, and advocates the theory that Earhart successfully landed on Gardner Island, now known as Nikumaroro.
- "About TIGHAR". Retrieved 2013-06-08.
- Lori Van Pelt (June 2006). Amelia Earhart: The Sky's No Limit. Tom Doherty Associates. p. 215. ISBN 978-0-7653-1062-0. Retrieved 2013-06-08.
Executive Director Ric Gillespie has visited the island of Nikumaroro in the Phoenix Island group seven times since 1989.