The famed drain-checking video of a fireman and accomplices, the only one to catch the first hit of WTC North also, according to the analysis here reveals the sonic boom of a NORAD jet just ast the plane hits. Although not mentioned in the article, it is interesting to note the strange flight pattern of a black winged object to the left of the WTC which goes in an arc from the lower left of the WTC to the point where the airplane has entered. (article 1)