If you haven't yet realized how important low-fare carriers are, come with me to Massachusetts.
Most airports encourage passenger traffic.
The Massachusetts Port Authority welcomes travelers to their state, but asks that you use airports in Rhode Island, Connecticut and New Hampshire to get there. They're even running an advertising campaign urging passengers to make the switch from Boston Logan. There are sound reasons for what only seems silly on the surface. Congestion at Logan is one of them. Southwest consistently offers fares lower than those generally available to and from Logan.