Knife Flights (15)
Trevor has the highest flight skill, so he is the best character choice.
There are multiple planes that you can use here. Buying the McKenzie Airfield will allow you to use the Red Plane inside the hangar after completing air trafficking missions. Also, yellow Crop Duster planes will regularly land here, which can be useful. Also, the stunt plant is small and nimble. The Jet is NOT recommended as it has a high learning curve for most players.
You must ensure that you get all 50 Under the Bridges as well as all 15 Knife Flights for the following achievement:
Close Shave - 20
Complete all Under the Bridge and Knife Flight challenges.