Alaska Airlines said on Friday that it has banned 14 passengers from future travel with the carrier after what it called "unacceptable" behavior on a flight from Washington Dulles to Seattle.US airlines and law enforcement agencies have bolstered security at Washington-area airports after reports of "mob behavior" by supporters of President Donald Trump on flights into the region before Wednesday's siege on the US Capitol, "raising concern about their departure."Seattle-based Alaska said a number of passengers on a flight out of Washington late Thursday "were non-mask compliant, rowdy, argumentative and harassed our crew members.""Because of their actions and non-compliance, we have banned 14 of those passengers from future travel with us," the airline said in a statement.