These expert-approved tips can help you snooze through turbulence, tantrums, and time zone changes.Credit: Getty ImagesWhen it comes to navigating life in the air, flight attendants have seen it all—and they know every trick in the book. From managing jet lag to making even the most cramped seat more comfortable, they’ve mastered the art of traveling—even in the not-so-glamorous modern age of commercial air travel. So when they share their go-to…