OB433: Gaslit by ATC

A student pilot's solo flight under a Bravo airspace shelf becomes a real-life case study in aviation miscommunication when a controller mistakenly identifies the wrong aircraft due to a stolen transponder code. The pilot, flying northbound toward a lake, is repeatedly instructed to turn in ways that don't match her actual flight path—because the controller is speaking to a different plane that stole her call sign. The confusion escalates as the controller assumes the pilot is lost, disoriented, or has faulty instruments, while the student remains calm, composed, and confident in her own navigation. The episode dissects the psychological trap of confirmation bias: once the controller believed the target was the student, every mismatched detail was rationalized as evidence of pilot error. The real culprit? A second aircraft that took off from the same airport with the same call sign, hijacking the transponder code. The resolution comes only when a third pilot on ADS-B spots the actual aircraft and alerts the controller. This incident underscores the critical importance of questioning assumptions, especially when data and reality don’t align. It also reveals a deeper vulnerability in the system: the removal of call sign mismatch alerts from radar scopes, which would have instantly flagged the error. The episode ends with a powerful lesson for both pilots and controllers: stay humble, verify your assumptions, and never let a data block override your judgment.