Aviation and Airport Security Practice Test.

Smaller airports may not have enough staff to maintain a sterile concourse after hours, as this requires constant monitoring and cleaning of the area to ensure no unauthorized individuals or items have entered. Additionally, smaller airports may not have sufficient resources to enforce double-screening procedures, which can be costly and time-consuming. Last departure gate screening is typically conducted during peak hours to avoid crowds at security checkpoints, so it may not be a major concern after hours. Sterile boarding areas are more easily maintained as they are typically limited to passengers who have already gone through security. Overall, sterile concourse is the most challenging concept to maintain at smaller airports after hours due to limited resources and staffing.