panel now to answer your questions. we have cnn aviation analyst david soucie and ken christensen, an aviation consultant and he worked with air force search and rescue. so, colonel, our first tweet to you, the tweet is is it about time too r to attach emergency locator beacons on airplanes? >> there are emergency locator transmitters on airplanes currently. both general aviation and emergency locate transmitters. they are on all commercial and military aircraft. >> so i want -- let me sort of follow up on this because e.l.t.s, right, isn't that what they are called? >> correct. >> so they have these e.l.t.s and i think there's more than one on a plane, they are not as reliable as say, you know a black box is very reliable.