News Summary: Airlines add North Dakota flights
OIL TAKES OFF: North Dakota's oil boom is creating more demand for flights, too.
UP AND AWAY: The western part of the state is a long drive from the nearest big cities — Minneapolis and Denver. So flying is an attractive way to get there.
NEW FLIGHTS: Delta Air Lines Inc. announced flights to Williston, N.D., on Monday. United Continental Holdings Inc. is adding Williston flights, too.