A federal judge ruled that UA was not responsible for crash at WTC but AA was responsible for the Boston checkpoint. This could loom over the head of AA , since they are in bankrupcy and probably will be out by the time this goes to court. Silverman Properties wants the insurance company of the responsible party to have to rebuild the towers.
http://www.usatoday.com/story/travel/flights/2012/11/21/united-world-trade-center/1720063/
http://www.usatoday.com/story/travel/flights/2012/11/21/united-world-trade-center/1720063/