Ignore the stupid box art, this one's just as much for adults as it is for kids.
On the easiest difficulty, you'll have maybe two planes in the air at any given time, with one or two on the ground waiting to take off. Landing the planes is easy, just move them to an empty gate, provided there isn't a plane on the runway blocking you.
On higher difficulty, especially on Expert, the game throws more planes at you that are trying to land, while also giving you a full airport with planes waiting to take off. Can you keep an eye on those planes flying over the airport? Can you adjust their speed in time so they don't crash into each other? On the ground, will the lanes get clogged with traffic? Can you recognize which plane should leave first so as to maximize the amount of points you get?
The later airports (which act as stages) give you more gates and more runways to deal with, and each airport can be played on 3 difficulty settings, each setting with a different goal. All in all, about 12 stages, which provide around 10-15 hours of gameplay if you want to beat all of the stages. I'm sure there are people that will enjoy playing the stages over and over again, as well.
Some things are frustrating, like there are times when you can't issue an order to a flying plane, like 'speed up' or 'slow down', and it never gives an explanation as to why it does that. Sometimes the plane is just flying and not doing anything, but I can't issue orders. This has led to several mid-air collisions for me. Also, I think simple 3D graphics could've added a little more to the presentation. I'm not sure if the game is part of a series or not, but it looks like a GBA port.
A fun little game that is pretty cheap; I picked my copy up at Best Buy for $20 US. Puzzle fans and gamers that enjoy brain teasing games will get a kick out of this.