Security checkpoints at the two busiest concourses at BWI Thurgood Marshall Airport will be temporarily closed at separate times this week to allow for construction, officials said.
The Concourse B security checkpoint is scheduled to be closed on Monday from 1 p.m. until Tuesday at 4 a.m. The checkpoint at Concourse A will remain open.
The Concourse A checkpoint is scheduled to be closed on Tuesday, from 1 p.m. until Wednesday at 4 a.m. The checkpoint for Concourse B will be open.
Airport officials recommend that Southwest and AirTran passengers use the new nine-lane security checkpoint between Concourses B and C, which opened last month. That checkpoint serves all airline gates on Concourses A, B and C.