I was scanning for airplanes in my area using an rtl-sdr ... and a couple times I could see planes with my eyes and they were not broadcasting a signal like the

I was scanning for airplanes in my area using an rtl-sdr ... and a couple times I could see planes with my eyes and they were not broadcasting a signal like they were supposed to.... FBI? Also, once I wasn't scanning but there was about 5 or 6 jets flying parallel at equal distance at high altitude covering the whole sky ... wonder what that could have been... they were all leaving a trail.