I'm a little late to the game and was not able to use Flight Track before Mobiata got acquired. I've been reading this thread and I don't really understand what made Flight Track so special that people are still sad about losing it some three years later.

In the most simple terms, can someone please explain to me what you were getting out of FlightTrack that none of the other apps are offering...what problem did Flight Track solve so well? And why was it so important that Flight Track worked with Tripit?