American Airlines is taking several new "precautionary" measures after one union reported several incidents of flight attendants "forced to confront passengers exhibiting politically motivated aggression towards other passengers and crew." American says one such measure is no longer serving alcohol on flights to and from Washington, D.C. The airline did not provide specific details on the incidents. The announcement came on Wednesday -- the same day thousands of pro-Trump supporters stormed the U.S. Capitol as Congress kicked off its joint session to certify President-elect Joe Biden's victory.