Southwest Airlines is developing a lounge at Baltimore/Washington International Thurgood Marshall Airport (BWI) as part of its first airport lounge network. The BWI facility is planned at nearly 33,000 square feet. View from the Wing reports that its footprint appears to include the airport’s former public observation gallery, the two-story space near Concourse C where visitors could watch aircraft. That reported reuse is the central unresolved detail: the available material supports the planned lounge, but the airline and airport have not independently confirmed that the observation gallery…