I use this site a lot. I mainly use it to take information on how much delay is expected, based on delay of arriving flight.
The information is accurate, at a level sometimes lower sometimes higher than airport monitors.
While inaccurate, it's still better than nothing; it helps me with hard to discover information, like delays of far away airports, or historic delays of local airport.
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Best Flight Tracker: Live Tracking Maps, Flight Status, and Airport Delays for airline flights, private/GA flights, and airports.