sentences:  The flight number 3456 is still used by China Southern and for the Chongqing-Shenzhen route but now with the Airbus A320 family or Boeing 737 Next Generation aircraft.The aircraft was a Boeing 737-31B registered as B-2925 and with serial number 27288.The aircraft was delivered to China Southern on February 2, 1994, and had recorded over 8,500 hours before the crash.