I remember seeing TV images at the time of a hijacked 737 crashing on an airport, pivoting around its nose and wingtip and falling inverted on a 757 about to take off. Very graphic images. I just checked the A.net archive and it returned zero. Then google gave only the short description I already knew:

Shortly after take-off a man entered the cockpit, telling the crew he had 7kg of explosives strapped to his body forcing the crew to fly to Taiwan or Hong Kong. All cockpit crewmembers had to leave the cockpit, with the captain remaining in his seat. The captain tried to fool the hijacker by circling for 30 minutes before approaching Guangzhou, telling the man he was going to land at Hong Kong.
In the final phase of the approach a struggle took place in the cockpit. The Boeing touched down hard, clipped a parked China Southwest B707 (B-2402) and then struck the left wing and top fuselage of a China Southern B757 (B-2812) which was waiting for take-off clearance.


http://aviation-safety.net/database/record.php?id=19901002-3&lang=en

Does anybody have more information about this crash?