Transponder Function News Today

And at 30,000 feet. but if they are out of range, the transponder will not work, correct? >> correct. >> and it can be turned off by a pilot or hijacker so it could have been flying over the land with no transponder function at all? >> you are absolutely right. i was talking to an air traffic controller about this. i said if the transponder goes off, can you track the aircraft and he said if they are flying at a low altitude, no. he had reports with a plane without a transponder disappeared from...