Discount airlines add flights to big cities from Reagan National. $LUV

<Online Dealsp> Southwest Airlines Co. is adding new service to seven cities from Reagan National Airport with the slots it won at the airport as part of the government's antitrust settlement with American Airlines Group Inc.

Southwest's plans confirm that the government's antitrust settlement with American is largely leading to increased service to big cities from Washington, D.C., at the expense of flights to smaller cities.

Southwest won...