Fyrstads Flygplats doesn't connect to many places other than Stockholm, however a connection to Frankfurt has been opened to serve mainly the Saab clientele. Sources say that this connection will soon be open to the public.
Bus connection is very good within the city, and also covers most of the countryside and almost all surrounding cities as well as major distant cities.
The standard fare is 20 kr which is valid within Zone 1 which covers the city, neighbouring cities and the countryside.
Taxis are on the expensive side. Taximeter is virtually always used but make sure that the driver really does turn it on unless a price has been negotiated in advance. Often the price can be better this way.
Trollhättan has many restaurants with many different categories of food. From Japanese, Thai and Chinese to English food and basic Swedish food. During lunchtime prices are very reasonable but tend to rise during the evening. Some of the restaurants converts into bars in the late evening.
Trollhättan is also famous for its many pizzerias which have Sweden's best (?) kebab-pizza. What makes the pizza special is the sauce which is different from kebab sauce in other parts of Sweden.