NPR's John Burnett reports on the American Airline Jumbo jet that crashed Tuesday night in Little Rock, Arkansas. The accident killed nine people including the pilot and injured more than 80. (4:15) NPR's Kathleen Schalch reports that an increasing number of teaching assistants at graduate schools are organizing and joining unions. They are no longer willing to accept substandard pay for teaching classes, grading papers, and doing research for their professors. Three years ago, about a dozen university campuses had unionized graduate students. Now there are union organizing drives at 25 more.