owned airplane. this is a jetliner that trave e traverses the globe, redundant seasons on boa systems on board. talk about the technology transmitting information. >> there's ways airliners stay in information with the ground, a traffic controllers, with their own headquarters. you have first of all just a pilot can call the controller, call headquarters and say here i am. this is what's going on. a may day for example. that's active communication. then you have radar. commercial flights have secondary radar. radar station beams the signal to the airplane. the airplane sends back a signal saying here i am. here's my identifier. i'm in the system. then you have a new technology called adsb.