Reward: Space Needle
Difficulty: Intermediate
Estimated Time: 15 minutes
This reward is for completing the Jet City mission. The timer doesn't start until you takeoff, so instead of taking off down the runway, I recommend that you taxi over to taxiway Alpha (one over to the right, parallel to the runway) and fly towards the target straight ahead. I know you'll end up going over some grass, but the Lear can take it. Don't takeoff until you're just a few hundred yards in front of it (the timer needs to start before you pass through it or else it won't count). Immediately after, put the gear up and slow the throttle to almost idle. It'll stay there for almost the whole flight. Turn towards the bridge to your left with a target underneath. I know it's a tight fit, but as long as you aim straight for the target you'll be fine. After going under the bridge, pass through the target straight ahead. You'll need to come up fast to avoid hitting the cranes.
From here on out, there's no planned route I can offer. It's simply a matter of passing through any target you can in the fastest amount of time. It's a good idea to save after every few targets or so. It took me quite a few attempts. Don't bother following the mission compass - just know that 21 out of the 30 targets are required so you might as well pass through all that you can. When aiming for a target, center it in your windscreen and you'll be perfectly lined up. The Lear turns great at 90 degrees of bank, so use it.
After you complete all the required targets, you'll have the remaining time to land back at Boeing Field. If you can't make it in time, both engines will catch fire but you might still be able to make it to the ground safely. Good Luck!