The pilot and aircrew on the military plane nervously watched Song Jinning search for electromagnetic frequencies. One of the crew members asked, "Director Song, can you determine where the interference is originating from?"
When an aircraft was in flight, it was constantly being exposed to different levels and types of electromagnetic interference.
Therefore, in the beginning, they had not realized that the situation was serious or that there was anything out of the ordinary. They had thought that the aircraft would filter and block it on its own.
Who would have thought that as the aircraft ascended higher and higher, that the electromagnetic interference they had encountered would strengthen?