Germany is such a compact country that, unless you're going from Munich to Hamburg, taking the train will probably be the more convenient, economical, and (in my opinion) fun mode of transport. In general, domestic air travel is geared mainly toward business travelers and therefore flying is not generally a popular means of travel within Germany. However, you will most likely arrive in and depart from Germany by air, and you may need to make a short hop from your initial arrival point (probably Frankfurt) to some other destination, or vice-versa, so here's what you'll need to know.