Hijk Mean News Today

>> but that only works if the transponder is turned on. >> sid spent 35 years in air traffic control for the faa and four years in the air force, guiding flights under fire in vietnam. he says without the planes transponder, aircraft traffic control is almost blind. >> this is what a flight looks like with the transponder on? >> correct. >> when the transponder is on, a data tag is very obvious. the pilot can use it to report an emergency. >> the letters hijk mean hijack. >> so without saying a ...

>> correct. >> you no yes it is? >> correct. >> you know how fast its going? >> right. >> you know the altitude? >> correct. here is the altitude, 22,000 feet. >> reporter: but that only works if the transponder is turned on. sid mcgurk spent 35 years in air traffic control for the fa a and four years in the air forces, at one time, guiding flights under fire in vietnam. he says without the planes transponder, air traffic control is almost blind. this is what a play looks like with the transpond...