Annual Aspen Security Summit brings together top national security leaders . Discussion tends to trend toward current events . The administrator says that is more of a concern than shoot - downs . There may be a less - publicized reason that 2009 underwear bomb did n't detonate .
Annual Aspen Security Conference brings together top national security figures . Discussion tends to trend toward current events . TSA administrator says improvised explosives more of a concern than shoot-downs . There might be a less-publicized reason that 2009 underwear bomb did n't detonate .