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And communicate. you talk to people. >> how do you communicate if transponder acars not working. im throwing around terms like im a pilot. im not. suddenly we know about acars. when those systems go down, how do you communicate. >> navigation and maintenance, im talking about radios, telephone, smartphone. you pick it up and go mayday, mayday, mayday. >> does it work at that altitude? >> at 40,000 feet you can talk to the world. >> youre saying a pilot has a phone in the cockpit, if everything w...