Updated 08-19-2015 03:09 PM
If you have created a custom Dino in Jurassic Park at the visitor center go in to the left enter the door to the lab create a Dino to use a flying one you first need to unlock one of the flying dinos. Now the way I got it was I did a flying Dino when I was playing JP4 I was at the aviary and used my custom flying Dino you need to use the dinosaur summoning machine it will only allow flying dinos in the aviary. That's how mine unlocked.