Aerial Challenges are story mode events that contribute to 100% completion in Grand Theft Auto V. Two contribute to 100% completion of the game. The categories are Under the Bridge and Knife Flight. There are 50 Under the Bridge challenges, but only 25 of these must be completed to go toward the 100% goal. And only 8 of the 15 Knife Flights need to be completed. Continue reading to find locations for completing all the Aerial Challenges.