Get a stunt plane from fort zancudo for better control, or grab a fighter jet if you're feeling confident. Max out trevor's flying skill first which makes everything way smoother and definitely hit flight school at los santos airport to practice the basics. Quick save before each attempt since crashing means starting over, and you'll need all 15 knife flights plus those 50 under the bridge challenges for the trophy.

The stunt plane works best for beginners since it's slower and easier to handle, while jets maintain altitude better during long maneuvers. Tilt sideways between buildings at marked spots on your map, and remember that practice really makes perfect here. Good to know that you only need 8 knife flights if you're just going for 100% completion, but might as well knock them all out while you're at it.

Fyi, if you're having trouble with specific spots try approaching from different angles or heights until you find what works best for your flying style. The challenges get way more manageable once you nail down the basic technique and figure out which aircraft suits you best.