Note the ETA is now 2144 wheels down, 2152 in the gate.

Airline schedule are always padded compared to flight time for taxi out/taxi in. The schedule says they'll depart the gate at 1930 and arrive at the gate at 2210 and we display that on FlightAware 2 days before departure.

24 hours before departure, the FAA's Enhanced Traffic Management System (ETMS) loads the airline schedules and sends us a message with their best estimate of wheels up departure time and flight time. The departure time is almost always the airline's scheduled gate departure time + 10 minutes and the time enroute is flight time only.

Throughout the day the airline and FAA will independently send us updates to both the gate and flight times. 30-120 minutes before departure the airline files a flight plan, ETMS digests it, and FlightAware gets an update. CO tends to file flightplans later than average, sometimes 30 minutes before departure.

If there's any last minute delays after the flightplan is filed, we'll get updates from the airline or FAA and adjust the flight times accordingly; as far as the FAA is concerned the flightplan is valid for 2h after departure, so the airlines typically don't file a new flightplan unless they want to make a change to routing/etc.

After departure ETMS will continue to provide ETA updates; the first one usually comes 0-15 minutes after departure. The airline will also provide gate time estimate updates.