It 's not a new threat , but one viewed as ongoing because they know the al Qaeda unit based in Yemen is constantly trying to improve its bombs . U.S. warned airlines this week about possible a bomb threat to U.S.-bound flights . Official attributed it to bomb - maker for Al Qaeda in the Arabian Peninsula . The threat is based on the latest intelligence . Al Qaeda said to still be interested in targeting airlines .
U.S. warned airlines this week about possible a bomb threat to U.S.-bound flights . Official attributed it to bomb - maker for Al Qaeda in the Arabian Peninsula . The threat is based on the latest intelligence . Al Qaeda said to still be interested in targeting airlines .