Right now with the construction going on in George Bush Int. Airport it can take hours to get through the line. Lucky for me I know a shortcut. If you can have someone drop you off, dont go to the terminals, go to the hotel. In the lobby there are elevators that can take you to an underground tram straight to where you need to go.

I used this last time I was there and made it to my gate in less than half an hour. Before I knew about this I had to get out of my ride's car and run so I wouldn't miss my flight.