An excellent effort for a portable flight sim.
The frustration, as everyone who's played this game will probably agree, come with mainly the controls, and lack of an intuitive tutorial. Also, some missions can be down right unforgiving and almost impossible to complete. Don't get me wrong, I like high difficulty in my video games, but some of these missions just overdo it, and I can't really understand why.
Getting back to the controls... Let me tell you this right now so you don't have to figure it out.. Hold SELECT for your landing gear, and hold L+Down to switch targets. The rest of the buttons can be discovered by experimenting, but those two are undocumented and absolutely necessary. Although the game has some tutorials, they just tell you what to do and never mention which PSP buttons control those actions, which is rather odd. The analog stick which serves as your flight control can be extremely sensitive depending on what kind of plane you're flying. I found that most of times, going in 1st person view really helped how well I could control the plane, so be sure to give it a try.
Overall, it's an ambitious work, but one that shows us that flight sims can be done and done well on the PSP. Had this game seen a little more polish and refinement, I'm sure it would have been a hit. Very much worth playing for people who love flying and willing to spend a few hours mastering the controls.