Question: What season is the plane crash greys anatomy?

Disambiguated questions and answers:
context: "One Flight Down" is the twentieth episode of the eleventh season of the American television medical drama "Grey's Anatomy", and is the 240th episode overall. It aired on April 16, 2015 on ABC in the United States. The episode was written Austin Guzman and directed by David Greenspan (filmmaker). The episode features a plane crash in Seattle bringing patients to Grey Sloan Memorial and old memories of the season 8's tragic plane crash that claimed the lives of Mark Sloan (Eric Dane) and Lexie Grey (Chyler Leigh) back to Meredith Grey, Arizona Robbins, Derek Shepherd and Cristina Yang.
question: What season was the plane crash that brought back memories of a plane crash?|What season is the second plane crash greys anatomy?
short_answers: eleventh season
Season 11
wikipage: One Flight Down (Grey's Anatomy)
context: No context provided
question: What season is the first plane crash greys anatomy?|What season was the plane crash that killed Mark Sloan?
short_answers: eighth season
Season 8
the eighth season
context: No context provided
question: What season was the plane crash that killed Mark Sloan?
short_answers: eighth season
Season 8
the eighth season
context: "One Flight Down" is the twentieth episode of the eleventh season of the American television medical drama "Grey's Anatomy", and is the 240th episode overall. It aired on April 16, 2015 on ABC in the United States. The episode was written Austin Guzman and directed by David Greenspan (filmmaker). The episode features a plane crash in Seattle bringing patients to Grey Sloan Memorial and old memories of the season 8's tragic plane crash that claimed the lives of Mark Sloan (Eric Dane) and Lexie Grey (Chyler Leigh) back to Meredith Grey, Arizona Robbins, Derek Shepherd and Cristina Yang.
question: What season is the second plane crash in Greys Anatomy?
short_answers: eleventh season
Season 11
wikipage: One Flight Down (Grey's Anatomy)

Long-form answers:
knowledge: content: Grey's Anatomy is an American medical drama television series that premiered on March 27, 2005, on the American Broadcasting Company (ABC) as a mid-season replacement. 
wikipage: Grey's Anatomy
long_answer: Grey's Anatomy is an American medical drama television series that premiered on March 27, 2005, on the American Broadcasting Company (ABC) as a mid-season replacement. "One Flight Down" is the twentieth episode of the eleventh season, and it features a plane crash in Seattle bringing patients to Grey Sloan Memorial and old memories of the season 8's tragic plane crash that claimed the lives of Mark Sloan (Eric Dane) and Lexie Grey (Chyler Leigh) back to Meredith Grey, Arizona Robbins, Derek Shepherd and Cristina Yang.
knowledge: content: "Flight" is the twenty-fourth episode and the season finale of the eighth season of the American television medical drama Grey's Anatomy, and the show's 172nd episode overall.
wikipage: Flight (Grey's Anatomy)
content: In the episode, 6 doctors from Seattle Grace Mercy West Hospital who are victims of an aviation accident fight to stay alive, but Dr. Lexie Grey (Chyler Leigh) ultimately dies.
wikipage: Flight (Grey's Anatomy)
long_answer: There were several planes crashes on the TV series "Grey's Anatomy". "Flight" is the twenty-fourth episode and the season finale of the eighth season and the show's 172nd episode overall. In the episode, 6 doctors from Seattle Grace Mercy West Hospital who are victims of an aviation accident fight to stay alive. "One Flight Down" is the twentieth episode of the eleventh season and is the 240th episode overall. The episode features a plane crash in Seattle bringing patients to Grey Sloan Memorial and brings back old memories of season 8's tragic plane crash that claimed the lives of Mark Sloan and Lexie Grey.