BBC News - Chie Kobayashi & Joel Guinto
Japanese authorities said late on Wednesday that the coastguard plane was not cleared for take-off on Haneda's runway. The plane was scheduled to deliver relief supplies to earthquake-hit areas.
According to officials, the JAL flight was cleared to land on runway 34R at Haneda while the coastguard aircraft was told to "taxi to holding point C5" - a place on the airfield's taxiway system where aircraft await permission to enter the active runway for take-off.
The transcript shows the coastguard aircraft acknowledged the call from air traffic to taxi to the holding point - its last transmission before the collision.The transcripts appear to contradict the coastguard plane's captain - the only one of the six crew to survive - who told investigators he had been given permission to enter the runway which the JAL airliner was approaching.
The BBC has also found information that suggests the series of lights at the relevant holding point may not have been working. But experts point out there are other visual cues like painted markings which would show where aircraft needed to stop short of the runway.