Free Fall Trophy

This trophy again has a medal of the same name which will appear at the top left when done right. As with all these miscellaneous trophies, it's pretty likely this will come naturally. However if it doesn't there's a pretty reliable way to unlock it in offline party mode with 2 controllers. Pick 2 vehicles with the least mass possible - UFO or Dee work well. Have both vehicles pick up missiles and go to a nice straight area where the missile will definitely make impact. Fire one of the missiles at the other vehicle and the instant the missile hits, have that vehicle fire too. There's a good chance you'll hit the ground with the second missile and propel yourself up very high. I was able to unlock it first try this way.