Avoid waiting at the airport
Christmas is one of the busiest travel times of the year. Unfortunately, you'll probably be picking someone up at the airport at some point. Be prepared to deal with huge crowds.
Even if your only stop is to pick friends up at curbside, airports are stressful. You may have to circle while waiting for their plane to land or luggage to be found. Perhaps you'll have to pay to sit in a parking structure. If the flight is delayed, things get even worse.
This year, make it easier on yourself and visit FlightAware. It offers live flight tracking for all major carriers. There is also tracking for some smaller air services.
You can quickly see if your visitor's flight is on schedule. Check flights by number or, if you forgot the number, you can view all flights by airport.