Just a word of warning: when a flight shows "Actual Arrival at xx:xx" on ual.com, it is NOT at the gate -- what they really mean is "Landed and Taxiing to Gate".

The status will update with "Flight Arrived at Gate" and a new time when the flight has actually arrived.

I've suggested that they replace the misleading "Actual Arrival" language with "Landed and Taxiing to Gate or similar -- we'll see if they actually do it.