Hey folks,
Sorry if this has been asked before but I have a question: I’ve noticed for some time now that if you use “Airport Tracker” to look, for example, at KJFK, it doesn’t always show all the flights coming or going to KJFK. Just now for example I was watching DAL127 inbound to KJFK lining up with other flights to land. After a few minutes the screen automatically refreshed and DAL 127 disappeared from the display while the other flights were still there. After another refresh, DAL127 reappeared and one of the other flights disappeared only to reappear a little later. This happens all the time with any flight. Does someone know why this happens? Thanks in advance 
Ron