A Japan Transocean Air Boeing 737-400, registration JA8998 performing flight NU-44 from Okinawa to Nagoya (Japan) with 148 passengers and 5 crew, was climbing out of Okinawa when the first officer's windshield cracked prompting the flight crew to return to Okinawa for a safe landing. The airline reported the outer pane of the 5 panes of the first officer's windshield cracked, the aircraft returned to Okinawa. A replacement aircraft took the 148 passengers to Nagoya about 55 minutes after landing back. A replacement Boeing 737-400 registration JA8939 reached Nagoya with a delay of 105 minutes.