Editor’s Note: Sign up for Unlocking the World, CNN Travel’s weekly newsletter. Get news about destinations opening, inspiration for future adventures, plus the latest in aviation, food and drink, where to stay and other travel developments. CNN  —  It feels like the summer of travel chaos only just subsided, but the holiday travel season is now upon us, with millions taking to the skies in one of the busiest stretches of the year for travel. Navigating the world of airports and airplanes at this time can be stressful, but if anyone’s an expert in holiday travel, it’s flight attendants. Intrigued to find out their tips and tricks, CNN Travel spoke…