This is a pretty new and huge terminal, built a few years ago so it's still pretty clean. A lot of the main airlines fly from this terminal like United and Hawaiian!
You do have to take a tram to the different concourses so make sure you allow enough time to catch your flights. There's lots of new eating places to eat before your flight or grab a meal for your flight. There's even some shops to do some shopping. Of course there's slot machines as well. It's Vegas.
One of the coolest things is the airplane display hanging from the ceiling right after you go through security. The airplane is made of butterflies of all the airline logos that fly out of terminal 3. How cool is that!