I don't know if it was one of the 'just kidding' reports or not, but originally the radar showed the plane starting to make a right (easterly) turn before it disappeared. When info came out that the plan had been tracked to the west I assumed it must have made a loop. The location from the letter certainly matches better with the initial reports. At this point I'm beginning to wonder if there really was a plane.
I thought one of the first tweets MsFacetious posted said the plane took a sharp right before disappearing also.