Baltimore-Washington International Thurgood Marshall Airport is warning neighbors that it will conduct flight tests of a seldom-used runway Tuesday night as part of the preparations for a construction project that will put it into service in September.

The airport will put the runway, known as 4-22, into use during one weekend in September when it will close two more active runways in order to pave their intersection. That work is scheduled for Sept. 9-12 but could  be moved to Sept. 16-19 depending on the weather.

BWI officials say residents of neighborhoods to the northeast and south of the airport may notice a temporary increase in air traffic between 10 p.m. and midnight Tuesday as the tests are conducted. The tests are being conducted to help airport, airline and Federal Aviation Administration employees become familiar with Runway 4-22 before it put into active use.