Partnair suggested that the F-16 fighter jet had been flying at a faster velocity and closer to the Convair than reported in the media. Therefore, the jet, which would have broken the supersonic barrier at that point, would have created a supersonic pressure wave that would have caused the Convair to disintegrate in mid-air. The National Aeronautical Research Institute, a Swedish aviation technology research facility, said that there was a 60% chance of this being the cause. The Norwegian F-16 pilot testified that his aircraft was more than above the Convair. The investigators concluded that the F-16 would have had to have been within a few metres of the Convair to have affected the passenger aircraft in such a manner and had found no evidence that the two aircraft were that close together, and the AIBN investigation found no connection to the accident. After the final report was issued, there was speculation that the AIBN had doubted the radar information that it received, leading the Thoresen brothers to file a lawsuit, but a ruling in the Norwegian "lagmannsrett" (intermediate court) dismissed this in 2004.