[s11e20] One Flight Down -

"One Flight Down," the 20th episode of Grey's Anatomy Season 11, aired on April 16, 2015, featuring a small plane crash that triggers severe PTSD in Meredith Grey and Arizona Robbins regarding their past trauma. Written by Austin Guzman, the episode centers on the staff managing crisis, concluding with a cliffhanger concerning Derek Shepherd's safety. Read the full summary on Wikipedia . One Flight Down | Grey's Anatomy Universe Wiki | Fandom