A domestic flight is a designation that refers to a commercial or private flight in which the airplane takes off and lands in the same country.
A domestic flight serves to move people around the country. The United States sees thousands of domestic flights every day. Some people take a domestic flight to meet an international connection -- for example, flying from a small regional airport to a large international one. Others take them simply to get across the country. Many domestic flights connect to other domestic flights, so passengers can get to a destination that is not serviced directly from the originating city. For example, from Fort Lauderdale, Florida, to Burlington, Vermont, a passenger will have to change planes in a larger city, such as New York or Detroit.
A flight is considered domestic as long as it does not cross international boundaries. A flight within Germany or within France is also a domestic flight, but a flight from France to Germany is an international flight, even though the actual distance flown may be very small.
Some domestic flights cover a small distance and are called short-haul flights. A domestic airline is one that offers no international services at all.