the germanwings crash investigation is raising so many questions. we've been asking you to submit yours on twitter. let's bring in our panel in new york jonathan gillian, former air marshal and fbi agent from washington. mary o'toole, senior profiler and special agent. and in new york a aviation analyst and contributing editor for "flying" magazine. welcome to all of you. les, to you first. eric asks this. should air traffic controllers be able to override a plane if the plane seems to be hijacked? >> it's kind of implausible for that technology to exist unless we get to a drone operation. but what in this particular circumstance what would anybody have done at this point, to take over the airplane. it was unfortunately written in the cards for this particular co pilot. >> and mary ellen, macro muse asking this going forward, how does a passenger know that the