Imgorthand/Getty Images Most airlines will warn passengers not to attempt to retrieve their phone if it falls between seats, or any other battery-powered gadget travelers can bring on board, well before take-off. The carrier's infotainment system or the flight attendants will advise passengers to inform a member of the crew in the event a gadget like an iPhone 17 Pro falls between seats. Trying to grab the handset might not seem like a big deal, especially if you've witnessed the fall and know exactly where it is. However, airlines have good reasons to instruct passengers to avoid picking up a lost device themselves, and one of them is related to the safety of everyone on board: Fire. Phones wedged between seats can be damaged by the complex machinery that powers the seat, which can lead to the battery catching fire following a thermal runaway event. If a phone drops between the cushions of your couch, you'd be tempted to reach for it. You may move the cushions to make more room.…