District Judge Alvin Hellerstein, who has taken charge of most of the legal cases arising from the
Lawyers for the airlines argue that WTC Properties' insurers have already covered the same losses the company, owned by developer Larry Silverstein, is seeking to recover from them.
The judge has to decide whether any losses that could be ascribed to the airlines are in a different category to those that have already been covered.
If he does, Silverstein will then have to initiate separate proceedings aimed at proving that the airlines were liable for their planes being hijacked -- a case which would effectively put the whole pre 9/11 aviation security system on trial.
Hellerstein had originally anticipated the trial concluding on Wednesday and had indicated that he would deliver a ruling immediately after hearing concluding arguments. But court officials said Tuesday that the hearing was likely to run into Thursday at least.