You know it's going to be a bad day when you find yourself falling through the air without a parachute! But let's say that, somehow, you were to fall out of an airplane and found yourself in that exact situation.
You have to keep that you have to think fast. If you fall out at 12,000 feet (about 2 miles up), you only have about 60 seconds before you hit the ground. In free fall, you fall at about 125 miles per hour (mph) if you have your arms and legs extended, and at that speed you will travel about 12,000 feet in one minute.
The first thing to do is to look for a body of water. If you can dive into water, it won't feel good at 125mph, but you'll survive if the water is deep enough -- at least 12 feet or so. Steer toward the water (it's helpful if you've been skydiving before and know how to steer as you are falling), and dive right in.