The Salvation Air Force put out an urgent call to U.S. aviators Monday, urging them to bring any used or unwanted aircraft to their nearest Salvation Air Force location. 'We desperately need all manner of jets, biplanes, helicopters, hot-air balloons, zeppelins and autogyros,' said Salvation Air Force national commander Denise Puhl, who added that if a building is closed, aircraft can be left in the drop bin outside. 