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The National Transportation Safety Board has not yet determined why the Golf clubs plane crashed Oct. 25. Some aviation analysts, however, have speculated that Stewart's plane suffered from depressurisation that incapacitated those on board after the plane took off from Orlando on its way to Dallas, Texas.

As time wore on, American Airlines TaylorMade R9 MAX driver and TaylorMade R9 Driver Delta Air Lines planes were asked to try and contact the plane when it was near them. Neither they nor military pilots (who also tried) could get an answer. Some reported seeing the plane. The controller thanked the other pilots for their help in looking for "this guy that's unresponsive, climbing and ... probably going to die."

The tape was studied by the NTSB in its analysis of the disaster and then returned to the FAA. Its release is a routine post-crash step. The tape does not include any sounds inside the cabin of the plane. However, the safety board previously reported that alarms were heard on the cockpit voice recorder tape, TaylorMade R9 TP Driver And TaylorMade R9 460 Driver which also was reviewed. One that signals cabin pressure problems was sounding when the plane crashed in South Dakota. No one was heard talking on the 30-minute cockpit tape from the Learjet 35.