Testing begins on SCCTD MetroLink extension to MidAmerica St. Louis Airport, US May 18, 2026 | News, North America News Testing has started on the 8.36-km MetroLink light rail transit (LRT) extension from the Shiloh-Scott Transit Center to MidAmerica St. Louis Airport in Mascoutah, Illinois. The project includes a new ... This content is available to only subscribers. Username or E-mail Password Remember Me Forgot Password