| Plastic Pull-Tight Seal | One-way locking mechanism; cutting or forced withdrawal normally leaves visible damage. | Approximately 10–25 kgf, depending on polymer and design. | Printed sequential number, barcode, QR code, or color coding. | No direct digital transmission. The seal number can be recorded against baggage, container, or shipment events in an airline or airport data system and then associated with SITA-compatible baggage messages or tracking records. | Aircraft catering carts, cabin service units, access panels, and low-to-medium risk compartments. | Lower strength than metal seals; identification depends on accurate manual or scanner-based recording. |
| Fixed-Length Plastic Seal | Fixed closure position makes substitution or rethreading easier to detect during inspection. | Approximately 15–35 kgf, subject to material and locking geometry. | Unique serial number, barcode, QR code, or pre-printed authorization code. | Passive data only. The unique seal ID can be captured at acceptance, loading, transfer, and release points and linked to baggage or cargo tracking records. | Baggage carts, mail bags, document pouches, and routine ground-handling equipment. | Cannot independently confirm location, time, or opening activity without a separate scan or inspection event. |
| Metal Strip or Wire Seal | Removal generally requires cutting or deformation, creating a visible break in the seal or wire. | Approximately 20–50 kgf, depending on metal gauge and closure construction. | Stamped or laser-marked serial number; optional barcode or QR code. | No built-in connectivity. Seal number and inspection status may be entered into operational systems and associated with electronic baggage or cargo milestones. | Higher-risk doors, aircraft equipment, bonded stores, and security-sensitive ground assets. | Metal can corrode or create sharp edges; visual inspection and handling controls are important. |
| Cable Seal | Cutting the cable or damaging the locking body normally provides clear evidence of unauthorized access. | Approximately 50–300 kgf; exact strength varies significantly by cable diameter and lock body. | Unique serial number, laser marking, barcode, QR code, or alphanumeric code. | Passive identifier only. The cable seal number can be scanned and linked to ULD, container, baggage, or shipment records within systems exchanging standardized operational events. | ULDs, cargo containers, bonded transport, aircraft doors, and high-value logistics units. | Usually requires cutters for authorized removal; installation and inspection can take longer than plastic alternatives. |
| Bolt Seal | High-visibility two-part closure; removal generally requires cutting or specialized tools and leaves permanent evidence. | Approximately 500–1,500 kgf for common high-security designs; certification must be checked for the selected model. | Stamped or laser-etched serial number; some versions support machine-readable codes. | No direct SITA data capability. The seal identifier can be manually or electronically associated with cargo, ULD, or transport-leg records. | High-security cargo containers, bonded freight, aircraft holds, and regulated supply chains. | Heavier and less convenient to remove; not suitable where frequent authorized access is required. |
| RFID-Enabled Electronic Seal | Electronic status may record opening, breakage, or a change in seal state, depending on sensor design. | Typically about 20–300 kgf; electronic capability does not automatically indicate mechanical strength. | Electronic identifier, optional printed serial number, barcode, or QR code. | Potentially supports automated reads, timestamps, reader location, seal status, and exception events. A separate integration layer is required to map these events to baggage or cargo records and exchange them with SITA-connected operational systems. | ULD tracking, premium cargo, restricted shipments, and operations requiring reduced manual scanning. | Higher cost, battery or reader dependency, radio-interference considerations, and integration effort. |
| Data-Logging Smart Seal | Can record opening, closure, shock, temperature, or time-based exceptions when the selected device includes those sensors. | Varies by mechanical design; commonly approximately 20–300 kgf for reusable electronic devices. | Device ID, cryptographic identifier, printed code, barcode, or QR code. | Highest data potential: event time, device identity, sensor exceptions, scan location, and audit history can be transmitted through a gateway and mapped to baggage, ULD, or cargo milestones. SITA-system compatibility depends on the approved interface and data model. | High-value cargo, pharmaceutical shipments, sensitive equipment, and end-to-end chain-of-custody programs. | Most expensive and operationally complex option; requires device management, calibration, connectivity, and data governance. |