We’ve been using FlightAware for several years now and absolutely love it!
My husband and I are semi-pro photographers and we adore Airport/Airplane photography. We’ve made a little business out of it called Endurance Photography. We’re nerds like that! 
If you are bored, or want to check out what we have, we can be found at EndurancePhoto.SmugMug.com
Now it’s time for me to check out the photos on here!
That one photo of Uniteds retro A320 tail with 2 other versions of United liveries is classic! 8)
Thanks! Every once in a while the timing works out where you get those at the gate.
My favorite is the 767 over the tents. United asked about that one, but when they saw it was old livery they quickly said “No Thanks”. We still have it framed in the house, so I can’t complain. Only wish the sky was clear, but hey it’s Colorado.
I’ll be uploading more and tagging them with the tail number as soon as I have a few hours (hopefully this weekend) to crank that out. We have tons of photos.