If you quickly double tap the fast-forward icon, it will stay locked in the "fast"
option, even if planes come close to colliding.
Flight Control HD Hints, Tips, Tricks, Secrets, & Glitches
Stay Away From Edges
It's always a good idea to stay away from the edges of the screen. When new planes
or helicopters come out, they can easily crash into the planes near the edge. You
won't have much time to divert them.