American Airlines will begin using the first part of what will become a new regional concourse at Ronald Reagan Washington National Airport this week. This initial section of aircraft apron, the pavement that will one day serve the new concourse's northern side, will handle up to 12 regional aircraft parking positions, according to the Metropolitan Washington Airports Authority. The full concourse is on schedule to open by July 2021. It is part of the larger $1 billion Project Journey that also includes new security checkpoints. When complete, all four concourses – the existing three plus the one under construction – in terminal B/C at Washington National will be connected inside security. American will eventually shift flights operated by 50-seat regional jets to larger ones with up to 76 seats when the 14-gate concourse opens.