NEW : TSA modifies rule , gives airlines discretion when passengers can board . TSA has since modified the rule , giving airlines and crews discretion over implementation , sources said . Canada changes rules after botched terror attack on U.S.-bound flight . Carry - ons with medical supplies , food , musical instruments will be banned . Measures expected to be in place at least several months , Transport Canada says .
NEW : TSA modifies rule , gives airlines discretion when passengers can board . Canada changes rules after botched terror attack on U.S.-bound flight . Carry - ons with medical supplies , food , musical instruments will be banned . Measures expected to be in place at least several months , Transport Canada says .