The length of time international express shipments spend in transit often weighs heavily on the minds of both senders and recipients, and delay troubleshooting requires a comprehensive approach from departure to delivery.
In this article, Weefreight will analyze common delay causes and troubleshooting strategies across four key nodes: flight transportation, transit connections, customs clearance, and final delivery, helping you pinpoint the source of the problem.
- Flight Transportation: The “Air Bridge” of Logistics: Delays Often Caused by “Force Majeure + Scheduling Changes”
Flights are the core vehicle for international express delivery across continents. Delays in this link are often directly related to “air resource scheduling” and “external environmental interference.” Common causes fall into three categories:
Weather and Air Traffic Control: Force-Majeure “Air Obstacles”
Extreme weather at the origin, destination, or route (such as heavy rain, snow, or airport closures caused by typhoons) is the most common cause of delays. For example, winter snowstorms in Europe often lead to widespread flight cancellations at Frankfurt Airport, and typhoon season in Asia can ground cargo flights at Tokyo’s Narita Airport for several hours. Furthermore, military exercises and air traffic control (such as temporary no-fly zones) can reduce route capacity, leading to delayed takeoff and landing times. This is especially true for international routes, where temporary adjustments to regulatory policies can place flights on hold.
Flight Scheduling and Capacity Adjustments: The “Dynamic Imbalance” of Logistics Resources
Cargo flights are not completely fixed. Express delivery companies or airlines may make temporary adjustments based on cargo volume. If a route experiences a short-term surge in cargo volume (e.g., due to an e-commerce promotion or seasonal replenishment), and the originally scheduled flight capacity is insufficient, cargo may be “reassigned” to a subsequent flight, increasing transportation time. Conversely, if cargo volume is too low, airlines may combine flights (e.g., temporarily adjusting a daily flight to an every-other-day flight), causing cargo to be delayed while waiting for cargo to be fully loaded. Furthermore, aircraft mechanical failures and crew scheduling issues (e.g., requiring a shift change due to overtime) can also lead to flight cancellations or rescheduling. These are considered “operational delays.”
Shipment Issues: “Intercepted” Before Loading
Shipments that fail airport security (e.g., containing lithium batteries without proper labeling, or containing liquids without leak-proof packaging) will be temporarily detained and require the sender to provide additional documentation or repack before loading, directly resulting in missed flights. If the shipment is “sensitive” (e.g., cosmetics or food) and compliance certificates have not been obtained in advance, airport customs may conduct a temporary inspection. During this period, flights may be unable to wait, causing delays.
- Transit Connections: The “intermediary station” in logistics. Delays are often caused by “information gaps + operational oversights.”
Most international express deliveries require transit through a transit airport (for example, Chinese express deliveries to Europe often transit through Dubai or Amsterdam). Problems with cargo handover and information synchronization during transit can easily lead to delays. There are two core reasons:
Transit Warehouse Operational Efficiency: Cargo Stuck in the Sorting Process
Transit airport cargo warehouses typically need to complete the “unloading – sorting – reloading” process within a short period of time (for example, cargo on a particular flight must be transferred to the next flight within two hours). If the transit warehouse experiences a surge in cargo volume (such as around holidays) and there are insufficient sorting equipment or manpower, cargo can become “backlogged.” For example, cargo that should have been sorted within one hour may not be assigned to the corresponding flight until three hours later due to queues in the warehouse. Consequently, the cargo misses its connecting flight and has to wait for the next one (which may be 12 hours or even 1 hour later). If the cargo label is unclear (e.g., due to moisture or wear, making the destination unclear), sorters will need to manually verify the information, which will also increase sorting time and cause connection delays.
Flight connection planning errors: “Late arrival of the previous flight + early departure of the next flight” time difference
Courier companies often plan connecting flights in advance (e.g., the previous flight arrives at 10:00 and is scheduled to connect to the next flight departing at 11:30). However, if the previous flight itself is delayed (e.g., arriving at 11:00), and the next flight departs as originally scheduled at 11:30, the cargo will naturally not be able to catch up and will have to be rerouted to a later flight. If the connecting flight is canceled prematurely due to weather or other reasons, and the information is not synchronized in time, the cargo may “wait aimlessly” in the transit warehouse until it is discovered and rerouted. The time lost during this period will also lead to overall delays.
- Customs Clearance: Logistics’ “Border Checkpoints”: Delays Often Caused by “Missing Documents + Compliance Issues”
Customs clearance is a critical step in international express delivery. If customs’ compliance review of goods encounters obstacles, delays are extremely likely. Common issues fall into three categories:
Incomplete/Incorrect Declaration Materials: The Main Cause of Customs “Stop-Checks”
If the sender fails to provide customs clearance materials as required (e.g., a missing commercial invoice, or a discrepancy between the declared value and the actual value of the goods—underdeclaration may be considered “tax evasion,” while overdeclaration may arouse customs suspicion), customs will request additional documentation. This process requires extensive communication between the sender, courier, and recipient, taking anywhere from one to two days to a week. If the declared product name is ambiguous (e.g., declaring “lithium battery power banks” as “electronic accessories”), customs may initiate manual inspection due to “unclear information.” This inspection requires unpacking and verifying the actual properties of the goods. If the declared value is inconsistent, the declaration must be revised, further extending customs clearance time.
Goods subject to inspection: “In-depth audits” for compliance
Customs will randomly inspect goods (especially sensitive and high-value goods). If the goods themselves are in compliance (e.g., correctly declared and free of prohibited items), the inspection typically takes one to two days to complete. However, if the goods have compliance issues (e.g., containing prohibited items—such as plant seeds banned by some countries, unquarantined food, or counterfeit goods—unauthorized designer bags and clothing), customs may temporarily detain the goods and may even initiate an investigation. The duration of this delay is uncertain (from as short as a week to as long as requiring cooperation with the investigation before release. If ultimately determined to be in violation, the goods may be confiscated).
Recipient’s Lack of Timely Cooperation: Customs Clearance “Stuck at the End”
Some countries require the recipient’s cooperation (such as providing personal ID and import licenses—for example, Brazil requires recipients to provide import qualifications for some electronic products). If the recipient fails to receive timely notification (such as unchecked text messages/emails) or fails to submit the required documents within the specified timeframe, customs clearance will be suspended. The goods will then have to wait in the customs warehouse until the recipient cooperates. This type of “artificial delay” is also a common cause of customs clearance delays.
Fourth, last-mile delivery: The “last mile” of logistics, where delays are often caused by “local resources + address issues.”
After customs clearance, goods must be delivered to the recipient by local delivery companies. Delays at this stage are often related to “local operations” and “delivery information”:
Backlogs at delivery warehouses: Local transportation capacity is insufficient.
If the destination is during peak logistics season (such as before Christmas in Europe and the United States, or after Singles’ Day in China), local delivery warehouses may be overstocked and couriers may be understaffed, so next-day deliveries may be delayed by 2-3 days. If the delivery area is remote (such as suburban or rural areas) and delivery frequency is low (e.g., twice a week), shipments may also be delayed due to waiting for a scheduled delivery day.
Incorrect delivery information/No one to receive the package: The package “cannot be delivered”
If the delivery address is incomplete (e.g., missing house number, misspelled street name), the delivery driver cannot locate the package and will return the package to the delivery warehouse. The delivery driver will need to contact the recipient to confirm the address and re-deliver the package, which takes 1-2 days. If the recipient is not at home (and there is no collection point), the delivery company in some countries will attempt to deliver the package 1-2 times. If there is still no one to receive the package, the package may be temporarily stored at a pickup point and the recipient will have to pick it up. This period will also be counted as a “delivery delay.”
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