We were heading to Las Vegas for a couple days of fun and games. Everything went good with check-in and we boarded the 737-900ER at Chicago-O'Hare. We did have priority boarding, so that worked out great for both of us. The flight was four minutes late in leaving, but was 22 minutes early in arriving at Las Vegas. The staff was friendly and efficient. The nice thing about arriving in Las Vegas sooner, is that old adage, "arrive sooner, gamble sooner". We got everything that we expected and paid for.