SimCopter

The Good
The variety of missions, the activity all around you (traffic, sims moving around, other air traffic if you have airport), light rail, sailboat, etc.), plenty of different choppers, ability to use your own cities (if you have SimCity 2000)

The Bad
Lack of 3D acceleration, lack of flight model (though most of the time you're too busy to notice), all objects are very low resolution (except your choppers), some impossible missions like the train rescue, the sims are stick figures

The Bottom Line
A civilian flight sim that features missions such as rescues, fire fighting, transportation, medevac, police assistance, chopper chases, riot control, traffic reporting, and more!