April 8, 2026, 10:36 am | Read time: 5 minutes

Why Suitcases Can Be Left Behind at the Airport

It’s advisable not to pack (intangible) valuables in checked luggage. The same goes for items you need urgently during a trip, such as medications. Luggage can always arrive late at the destination or even get lost.

The internationally recognized Montreal Convention stipulates that affected individuals are entitled to financial compensation in such cases. However, it’s clear that money doesn’t immediately replace the practical use of missing items. Arriving at your destination without clothing, toiletries, or personal items and potentially staying for several days can be extremely unpleasant. “If this happens on a larger scale,” aviation expert Cord Schellenberg told TRAVELBOOK, “it likely has one of the following reasons.”

1. Classic System Errors

Expert Schellenberg first cites system or infrastructure issues as common causes. These include failures or malfunctions of baggage sorting systems and conveyor belts, which prevent luggage from being forwarded correctly. Other technical disruptions–such as software errors, scanner problems, or delays in automated sorting–can also result in suitcases being left at the departure airport. In such cases, it’s not human error but interruptions in the technical process that hinder the smooth transport of luggage.

2. Personnel Causes

Cord Schellenberg mentions other potential complicating factors, such as strikes by ground service staff, which can disrupt the reliable loading and unloading of aircraft. A general shortage of personnel in baggage handling can also lead to operational bottlenecks and organizational problems, causing luggage to be lost or at least temporarily left behind.

3. Physical Problems with the Suitcase

Another common error in the handling system involves the barcode or luggage tag: If the label falls off, is damaged, or if there are even two on the same piece of luggage, the system can no longer identify where the suitcase belongs. Similarly problematic are suitcases with unusual shapes or items attached externally, such as straps, tags, or accessories, which can get caught in the automatic sorting systems.

Also interesting: Remove barcode stickers from your suitcase immediately after the trip!

4. Suitcases Checked in Too Late

You may have checked in your suitcase seemingly on time at the counter. However, whether it was truly “on time” is often determined behind the scenes–sometimes just before departure. Especially with tight connections, delays, or at large airports with long transport routes, luggage may arrive too late at the aircraft and not be loaded. For travelers, this is usually not apparent at check-in or the baggage carousel. It’s only at the destination that it becomes clear the suitcase is missing and needs to be delivered later.

5. Security-Related Measures

Various security measures can cause delays. For example, if luggage is separated for security reasons for further inspection, the affected suitcase may be loaded late–and miss the flight. The same risk applies to customs issues.

More on the topic

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6. Operational Influences in Flight Operations

External factors can also cause luggage not to arrive as planned, according to expert Schellenberg. For instance, weather conditions like strong winds or changed flight routes–such as due to closed airspaces–can require an aircraft to carry more fuel.

High temperatures can also play a role: If an aircraft is fully loaded relative to the runway length, the takeoff weight must be reduced. In such cases, passengers and/or luggage may be left behind. “On long-haul aircraft, booked air freight can also be ‘offloaded’ to reduce the load.”

7. Error-Prone Processes in Baggage Transfer

The most significant factor for luggage being left behind is the transfer between flights. According to the SITA Baggage IT Insights 2025 analysis, about 77 percent of the issues that lead to problems occur during the transfer to connecting flights. This process is under significant time pressure, especially with tight connection times, making it particularly error-prone. Delays or luggage being left behind often occur even in normal operations and apparently cannot be completely avoided, even with smoothly functioning technology and sufficient personnel.

Fortunately, lost luggage is rarely permanently missing–it is usually delivered later.