Yes, in 2026, you are still legally required to use airplane mode on flights primarily as a safety precaution to prevent electromagnetic interference. While modern planes are highly shielded, cell phones are designed to broadcast high-power signals to reach ground towers from miles away. When hundreds of devices are active, the cumulative effect can create "audible buzzing" in the pilots' headsets, potentially drowning out critical instructions from Air Traffic Control during sensitive phases like takeoff and landing. Furthermore, as a plane moves at 500 mph, an active phone constantly switches between ground towers, which can "clog" the cellular networks on the ground. In 2026, while many airlines provide "In-flight Wi-Fi," this operates on a specific, tested frequency that does not interfere with the aircraft’s avionics. Turning on airplane mode also benefits you by conserving battery life, as your phone will stop draining power in a futile search for a signal at 35,000 feet. Failure to comply can technically result in fines, as it is considered a violation of FAA safety regulations.