Last week, the Air Transport Association forecasted that there will be as many as 27 million flyers over this Thanksgiving holiday. Despite expected delays, there are ways to help yourself—and your fellow travelers. Save time at security by heeding the rules of the TSA. You can make that easier on yourself with some one-stop shopping, or you can expedite the whole process. And sometimes, it doesn’t matter what you do, so be ready for anything with an air-travel treasure map.