[4]: 06  The crew of Flight 611 made a crosswind landing at a speed of 131 knots (243 km/h; 151 mph), slightly higher than the reference airspeed.

[4]: 07 The flight crew shut down both engines but this action disabled the anti-skid braking system, and during the landing rolls the inner tires on both main gear legs burst almost simultaneously.

The investigators initially suspected that a mechanical failure had caused the accident,[6] but five days later, the AAIC stated that the flight crew's actions was more likely because of the high-speed landing.

[7] The AAIC determined that the cause of the accident was the flight crew's inappropriate decision to shut down the engines and the captain's delay in applying the brakes.

[8] A criminal prosecution of the captain, citing negligence, was opened by the Naha District Prosecutor's Office, but the case was later dismissed due to lack of evidence.

[8][9] Aviation official determined that Ishigaki Airport's runway length of 4,900 feet (1,494 m), was insufficient for the Boeing 737 to land on safely.