I have been using Passur for years; it is not always working but now it freezes my PC at times. My friend departed from JFK on June 30. When I attempted to see which runways were in use, Passur froze my PC. I had to go back to the IE Icon to un-freeze it. Passur finally came-back this morning, July 2. This is not a reliable site. I use the free version; hopefully the upgraded version, which has a fee, doesn't freeze. It seems that whenever I need it, it is useless. I've also yet to find a cellular that is compatible with Passur. I've tried loading Firefox into them, but still can't get the Passur aircraft arriving or departing.