PoliticalGraveyard.com
The Political Graveyard: A Database of American History
Politicians: Death On Board Airplanes
(other than in aircraft accidents)

Very incomplete list!

in chronological order

  Walter Holden Capps (1934-1997) — also known as Walter H. Capps — of Santa Barbara, Santa Barbara County, Calif. Born in Omaha, Douglas County, Neb., May 5, 1934. Democrat. University professor; delegate to Democratic National Convention from California, 1996; U.S. Representative from California 22nd District, 1997; defeated, 1994; died in office 1997. Suffered a heart attack while on a flight from California to Washington, D.C., and died shortly afterward in a hospital at Reston, Fairfax County, Va., October 28, 1997 (age 63 years, 176 days). Interment at Santa Barbara Cemetery, Santa Barbara, Calif.
  Relatives: Married to Lois G. Capps (1938-).
  See also congressional biography — Govtrack.us page — votes in Congress from the Washington Post — NNDB dossier — Find-A-Grave memorial
  Tauese Pita Fiti Sunia (1941-2003) — also known as Tauese P. F. Sunia — Born in Fagatogo, American Samoa, August 29, 1941. Democrat. School teacher; lawyer; Lieutenant Governor of American Samoa, 1993-97; Governor of American Samoa, 1997-2003; died in office 2003; delegate to Democratic National Convention from American Samoa, 2000. Congregationalist. Samoan ancestry. Died, on a flight to Hawaii for medical treatment, over the Pacific Ocean, March 26, 2003 (age 61 years, 209 days). Burial location unknown.
  Relatives: Brother of Fofó Iosefa Fiti Sunia (1937-) and Ipulasi Aitofele Sunia.
  Political family: Sunia family.
  See also Wikipedia article — OurCampaigns candidate detail
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