The Portland International Jetport today announced that Southwest Airlines will expand their summer seasonal Saturday Chicago Midway service to Saturday and Sunday service starting June 7, 2020. Additionally Southwest is adding Saturday service to Nashville, Tennessee. The service was announced today with the release of their June 7 - August 10 schedule. This expanded service means Southwest Airlines now serves three non-stop destinations from the Jetport during the summer. Southwest will continue to operate their daily flights to Baltimore.