The Ravens-Steelers rivalry may never die, but a Pittsburgh-based restaurant chain is hoping Baltimore diners will overlook regional differences when it comes to sandwiches. Primanti Brothers Restaurant and Bar, the famed Pittsburgh sub shop, will open its first Baltimore-area store this spring. The 5,200-square-foot restaurant will be a short drive from Baltimore/Washington International Thurgood Marshall Airport, at 996 Corporate Blvd. in Linthicum Heights, according to a representative for the company.