The jetpacks that Martin Aircraft makes are personal flying machines, but use ducted fans instead of proper jets. They can reach a maximum altitude of 3,000 feet, which means they can reach the entire 2,722 feet of the Burj Khalifa. The jetpacks fly at a top speed of 45 mph, so they can reach the top of the world’s tallest building in roughly a minute. With a total flight time of 30 minutes, that gives pilots a little room to see the problem first-hand and maneuver around. The jetpacks can also fly unmanned or remotely piloted, so a rescuer could bring an extra jetpack to a stuck person and a pilot on the ground could fly them home.