WD
This is true but the calculation was based on CYHZ which was some way from the original pan call. I remember the speculation about this along the lines that, had the crew declared a full emergency Mayday Mayday then there may have been an airfield in the immediate vicinity of the call that could have accomodated an overweight landing. I don't have any maps to confirm this and I'm not trying to be judgemental, this was the crew room speculation at the time.