Crewmembers may be directed to passenger-screening lines as part of a random screening-selection process, or whenever the KCM access point is not operational. Should the KCM access point become inoperative, TSA security officers will direct crewmembers to the passenger-screening checkpoints.

The security process for flight attendants varies by country and airport, but in the United States, they primarily use the Known Crew Member (KCM) program. This allows authorized pilots and flight attendants who have undergone extensive background checks to enter "sterile" areas of the airport through dedicated, expedited checkpoints. At these locations, they simply flash their airline ID and have their identity verified against a national database, often bypassing the standard X-ray machines and metal detectors that passengers must use. However, they are still subject to random "unpredictable" screenings where they must go through the full passenger-style security process. In airports where KCM is not available, or for international flight attendants arriving from abroad, there is often a dedicated crew lane at the main security checkpoint. This lane is separate from the general public to ensure crews can reach their gates on time, but they must still undergo full screening of their persons and bags. Regardless of the lane used, flight attendants are strictly prohibited from carrying certain items and must adhere to all TSA or local aviation authority safety regulations to maintain their security credentials.