It is physically impossible to open a standard plug-style aircraft door while at cruising altitude due to the extreme pressure differential. At 35,000 feet, several tons of air pressure are pushing the door into its frame; no human has the strength to overcome this force. However, if a door were to open at a lower altitude where the pressure is lower, it would lead to explosive decompression. The air inside the cabin would rush out instantly, creating a powerful vacuum effect that could pull unsecured objects and people out of the aircraft. The temperature inside would plummet to sub-zero levels, and a thick fog would fill the cabin as moisture condenses. In 2026, aircraft are equipped with sophisticated locking mechanisms, but the main "safety" remains the physics of the pressure. If an individual attempts this in flight, they will be immediately restrained by crew and passengers and face life imprisonment or massive federal fines upon landing for endangering the aircraft.