Apparently, the idea that he was going to take off in such heavy fog so struck the line personnel that one of them got out a cellphone and made a video of the 340 taxiing out. They then moved to an area on the ramp closer to the runway, near midfield. After a long delay during which the pilot performed his preflight checks and copied an IFR clearance to Key West, they recorded his takeoff roll on Runway 9L. In the video, which can still be seen on YouTube, the airplane is hidden by the fog, but it appears from the glimpses of bluish sky at the top of the frame that, despite an automated weather observation of a 300-foot overcast ceiling, the fog layer was in fact quite thin and there were no clouds above it. Witnesses estimated the visibility within the fog as 400 to 800 feet.