Before I say anything your eyes and ears are the best way to find airplanes in the sky. My usual flying sport is near a class g airport and I am aware of where the traffic pattern is and where planes would be approaching on both runways. I usually use flightaware to see live traffic that is too far out for me to see but just to know that they are coming. The problem with flightaware is that it is to glitchy for my device, flightradar24 seems to be a little better but just wondering what you would recommend.