A design flaw in the cabin pressurization system of a small airplane was determined as the probable cause of the September 2014 crash that killed Larry and Jane Glazer, Rochester real estate developers and benefactors. That's according to a National Transportation Safety Board report issued this week.

Larry was at the controls on September 5 when, about an hour and 40 minutes after departing Rochester for Naples, Florida, the Daher-Socata TBM900 began to not comply with communication from air traffic control. Suspecting hypoxia, or loss of oxygen, F-15s were sent up. The report states both people onboard appeared to be unconscious, and the emergency exit's door was sunk into the fuselage of the plane, indicating a depressurized cabin.

The incident played out on worldwide television as the plane headed out over the sea, through Cuban airspace, where fighter pilots broke off contact, and ended with a crash in the waters near Jamaica.

Back in Rochester, both Larry and Jane were widely mourned.

The NTSB determined that the cabin pressurization system was "prone to unnecessary shutdown;" specifically, an overheat switch activated, cutting off the air supply to the cabin, resulting in a loss of cabin pressure and ultimately, after flying out of fuel since the pilot was passed out, causing it to crash. 

The Glazer family have filed a wrongful death lawsuit against the manufacturer of the aircraft.