What Happens to Luggage After Check In

What Happens to Luggage After Check In

Once passengers have checked in their luggage at the airport, these enter the baggage-handling process. From security screening and automated sorting to aircraft loading, bags pass through several stages before reaching their destination. 

So, what happens if during security screening, something is flagged by the scanner, and airport security needs to inspect a locked bag while its owner is elsewhere, enjoying duty free? And why does the type of lock used make a difference?

Understanding what happens to checked luggage helps explain why choosing a Travel Sentry-Approved lock is an important consideration for both luggage brands and travelers.

The journey from check-in to baggage reclaim

1. Check-in and baggage tagging

The airline attaches a baggage tag to a checked bag linking it to the passenger's journey and destination. The bag then enters the airport's baggage-handling system, where scanners, conveyor belts and automated sorting equipment help direct it toward the correct flight.

From this point on, much of the handling takes place behind the scenes, away from the passenger.

2. Security screening

Before checked luggage is loaded onto a plane, it undergoes the required security screening. Scanners are used to identify luggage that may require further examination.

If a bag is flagged for additional inspection, authorized security agents may need to open it to search its contents. This preflight screening happens without the owner present, meaning, if locked, security agents need to be able to get in. This is the process for airports globally, with China and Thailand updating their legislation in 2026.

What can flag a checked bag for inspection?

Most manual inspections are triggered by items that are either prohibited in the hold or difficult to identify on an X-ray image. Common examples include:

• Spare lithium batteries and power banks: Under International and US FAA rules, spare batteries and power banks are not allowed in checked bags because of the fire risk. If these devices are packed in checked baggage, they should be turned completely off and protected from accidental activation. Here’s some more information about why power banks can't go in checked luggage. 
• Dense electronics and cables: Tightly packed devices, chargers and cords can obscure an X-ray image, which may lead security officers to search the bag to understand what is inside.
• Aerosols, self-defense sprays and high-strength alcohol: Toiletry aerosols are allowed in limited quantities, but non-toiletry flammable aerosols such as spray paint are not and drinks over 70% alcohol by volume are banned outright. U.S. rules allow one small pepper spray in checked baggage, but international aviation regulations prohibit self-defense sprays entirely.
• Large quantities of powders or dense food: Bulk protein powder, spices or dense food items can appear as opaque masses on scanners and may need to be checked by hand.
• Tools, sharp objects and sports equipment: Items such as hiking poles and heavy tools are usually allowed in checked bags, but their shape and density can prompt a closer look. Firearms and other regulated items must be declared to the airline.

A bag can also be opened for routine checks, which is exactly when the dual access TSA lock adds so much value. Brands selling smart luggage should also make sure batteries are removable, as most airlines require them to be taken out before a bag is checked.

If a lock cannot be opened using a secure tool, security agents may need to cut it off to access the suitcase if it needs to be search by hand. For travelers, this can mean arriving at their destination with a damaged lock or suitcase. 

3. The benefit of a Travel Sentry Approved Lock

Travel Sentry-Approved locks have a dual access system, which allows authorized security officers, to open the lock using a secure tool, inspect the luggage and re-lock the bag the search. 

This means the lock can remain intact following a routine inspection at over 850 airports using the Travel Sentry system, helping reduce the risk of damage caused by forced access. At airports where the system is implemented, security agents are trained at spotting the Travel Sentry Red Diamond and then using the correct tool to open the suitcase, before searching the contents and relocking the bag. 

4. Onto the airplane

Once the necessary screening procedures have been completed, luggage is sorted for its flight and transported to the plane and ground-handling staff load the bags into the hold.

After landing, the luggage is unloaded and transferred to the airport's arrival baggage system or, for connecting passengers, to the next flight. Eventually, the suitcase reaches baggage reclaim and the carousel, where the passenger can collect it.

Why luggage brands should communicate the importance of Travel Sentry TSA locks

Consumers often choose luggage based on its quality, durability, size and price; however, the type of lock fitted to a suitcase is another important consideration.

Clear communication can help brands:

• Educate customers: Explain the journey of a checked bag and why airport security may need to inspect checked luggage.
• Practical product benefit: Show how a Travel Sentry-approved lock allows authorized inspection without requiring the lock to be cut open.
• Support informed purchasing decisions: Help travelers understand the difference between a conventional lock and one designed for authorized security access.

A luggage lock may be a relatively small component of a suitcase, but it plays an important role in the overall travel experience.