Get ahead of time.
"I once arrived early at my gate for a flight to Denver and set my watch ahead to the local time there. When the next flight was called, I boarded (with my watch set ahead, I believed I was getting on my flight), and settled in. I became curious, though, as the pilot kept updating us during the flight on the weather in Dallas. Let's just say that my 'detour' taught me a lesson: Set your watch ahead after you take off." - Sanjay Gupta, CNN Chief Medical correspondent