I thought an entirely separate but meaningful addendum would be to present to the next-of-kin of each passenger ... a US flag that was flying on Tuesday in our nation's capital. Who knows where the plane would have hit. Give them the flags from the White House, State Department, Congress, etc. Have senior administration officials visit the NOK and present the flag with a personal note from the President. Might not seem like much, but the families might treasure the flags.
This is excellent news, if I am understanding it rightly, on more than one front. First, it rules out lawsuits for wrongful death for the surviving family members. Second, it provides a pattern for any passengers in future situations. Third, their votes make every passenger on that flight eligible for the Presidential Medal of Freedom, in my opinion.