Police officers walk behind the tail of the crashed Cypriot Helios plane on a hillside in Grammatiko, 40 kilometers (25 miles) north of Athens, Greece, Aug. 22, 2005. Some aviation experts are citing pilot hypoxia as a leading theory for why an unresponsive business plane flew over the nation’s capital Sunday, June 4, 2023, and caused the military to scramble fighter jets. Greek investigators said pilots on a Cypriot airliner did not realize an automatic pressurization system was set to “manual” when a loss of cabin pressure and oxygen led to hypoxia and the plane’s crash in Greece in 2005, killing all 121 people on board. (AP Photo/Petros Giannakouris, File)
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