I understand that, unlike in Europe, an American commercial organisition could (up to now) insure against acts of war or terrorism.
While airlines at Boston, and I think all US airports, are responsible for their own security, is it not possible that this responsibility is contracted out to the airports? If true, and if Boston (or Dulles) failed to fulfill the terms of that contract, we could be in for a monster complicated court case of the WTC owner and the insurance companies (the WTC was not fully insured) sueing the airline who in turn sue the airports. Scary!