Question: What type of plane was Octávio Augusto Ceva Antunes on when he went missing?

Context articles: Ajjamada B. Devaiah
Octavio Augusto Ceva Antunes
Murder of Dora Bloch
Arnaldo Antunes
Air France Flight 447
Draconyx
Natasha Ryan
Aviastar Flight 7503
Robert B. Tresville
Kholat (video game)

Ajjamada Boppayya Devayya was the only Air Force Officer to be awarded the Maha Vir Chakra (MVC) posthumously so far.
 The Maha Vir Chakra is the second highest wartime gallantry award and is less in precedence only to the Param Vir Chakra.
 During the 1965 India-Pakistan War, Sqn Ldr A B Devayya (called 'Wings of Fire') was part of a strike mission (on the Pakistani airbase Sargodha) when he was attacked by an enemy aircraft.
 He shot down the enemy pursuer's plane but in the process his aircraft was damaged and he went missing.
 Presumably he died in Pakistani territory.
 23 years later, in 1988, he was posthumously awarded the retrospective MVC award for this feat in the 1965 conflict.
Octávio Augusto Ceva Antunes was a professor of chemistry and pharmaceutics at the Federal University of Rio de Janeiro who had published over 200 scientific articles during his veteran career at the university.
 Antunes had also served as consultant to the World Health Organization for the production of anti-HIV drugs for four years until 2008.
 He was among 228 passengers aboard Air France Flight 447 from Rio de Janeiro, Brazil to Paris, France, which disappeared over the Atlantic Ocean on 1 June 2009.
 His wife Patricia Nazareth Antunes and their 3-year-old son Matthew were also aboard.
In June 1976, Dora Bloch, a dual Israeli-British citizen, was a hostage on Air France Flight 139 from Tel Aviv to New York, which was hijacked after a stopover in Athens and rerouted to Entebbe, Uganda.
 Bloch was taken ill on the plane and was taken to a hospital in Kampala; she was not rescued with the other hostages during Operation Entebbe, but went missing from the hospital.
 Her disappearance led to Britain cutting diplomatic ties with Uganda.
 Her body was discovered in 1979 in a sugar plantation near the capital.
 In February 2007, declassified British documents confirmed that she was killed on the order of Idi Amin.
Arnaldo Antunes (] , born Arnaldo Augusto Nora Antunes Filho, September 2, 1960) is a Brazilian musician, writer and composer.
 He is well known as a former member of rock band Titãs.
 After 1992, he embarked on a solo career spanning six albums.
 He has also published poetry, and had his first book published in 1983.
 He is known internationally for his collaborations with Marisa Monte.
Air France Flight 447 (AF447/AFR447) was a scheduled passenger flight from Rio de Janeiro, Brazil to Paris, France, which crashed on 1 June 2009.
 The Airbus A330, operated by Air France, entered an aerodynamic stall from which it did not recover and crashed into the Atlantic Ocean at 02:14 UTC, killing all 228 passengers, aircrew and cabin crew aboard the aircraft.
Draconyx (meaning "dragon claw") is a genus of dinosaur from the Late Jurassic.
 It was an ornithopod which lived in what is now Portugal and was a herbivore.
 It was found in the Lourinhã Formation in 1991, and described by Octávio Mateus and Miguel Telles Antunes in 2001.
Natasha Anne Ryan (born 1984) is an Australian woman who went missing in 1998 as a young teenage girl from Rockhampton, Queensland.
 Police assumed she had been murdered by a local serial killer.
 Ryan was discovered alive in 2003 during the trial of the man accused of her murder, almost five years after she went missing.
Aviastar Flight 7503 (MV7503/VIT7503) was a scheduled 60-minute passenger charter flight, operated by Aviastar (Indonesia) en route from Andi Jemma Airport, Masamba, to Sultan Hasanuddin International Airport, Makassar, Indonesia.
 On 2 October 2015 it was reported that the de Havilland Canada DHC-6 Twin Otter aircraft, registered PK-BRM with 10 on board, went missing from air traffic controller near Palopo 11 minutes after takeoff.
 There was no distress call from the plane.
Robert B. Tresville Jr. (May 9, 1921 – June 24, 1944) was an African American pilot who served in the original 332nd Fighter Group of the United States Army Air Forces, also known as the Tuskegee Airmen, during World War II.
 He was only the seventh African American to graduate from West Point.
 He was Commanding Officer of the 100th Fighter Squadron and was widely considered to be one of the 332nd Fighter Group's most promising leaders.
 He went missing in action after his plane went down over the Mediterranean Sea in June 1944.
Kholat is an indie survival horror video game developed by Polish developers IMGN.PRO, in which the player controls a protagonist who is tracing the steps of a group of nine Russian college students who went missing in February 1959 on Kholat Syakhl.
 The game is based on the Dyatlov Pass incident, a true event that involved ten Russian students, nine of which went missing on Kholat Syakhl and were found dead in the time span of four months (the tenth student had walked back earlier due to illness).
 Холатчахль ("Kholat Syakhl") is a transliteration in Russian of Holatchahl, meaning "Dead Mountain" in Mansi.