Of all disasters that can befall a plane, probably none is more terrifying than a sudden, near vertical dive at full speed into the ground. In today’s episode, will look at some of the reasons that this kind of accident can occur. The context, of course, is the crash last Friday, January 31, 2025, by a Learjet 55 less than a minute after takeoff from North Philadelphia airport.

In the weeks ahead, accident investigators from the National Transport Safety Board will interview witnesses, collect and examine the wreckage, study maintenance records, and, if it is available, review data from the plane’s flight data recorder to understand what caused the crash and issue safety recommendations to prevent similar tragedies from recurring. As they assemble the evidence, investigators will be thinking about similar accidents that have happened in the past, looking for patterns to guide them in their search for the causal factors.

In today’s episode we’ll run through a far-from-exhaustive list of some possibly relevant antecedents to Friday’s crash.

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