Bag tag
A bag tag, also known as a baggage check or luggage ticket, is a document attached to checked luggage to facilitate its routing and identification by transportation carriers. Invented in 1882 by Canadian John Michael Lyons of Moncton, New Brunswick, the modern bag tag is a critical component of global air travel logistics, ensuring passenger baggage is matched to flights and delivered to the correct destination. The tag's primary identifier, the ten-digit license plate number, is encoded in a barcode or RFID chip and links the physical bag to passenger and flight data within automated airport sorting systems. The evolution from simple paper tags to sophisticated electronic versions reflects ongoing efforts to improve security, efficiency, and passenger convenience in the aviation industry.
Historical Development and Early Systems
The first patent for a bag tag system was granted to John Michael Lyons of Moncton, New Brunswick, on June 5, 1882. His invention was a 'separable coupon ticket' that showed the issuing station, destination, and a consecutive reference number. The lower half was given to the passenger as a claim check, while the upper half was inserted into a brass sleeve and attached to the baggage with a strap. This basic principle of a separable ticket for passenger and carrier established the foundational model for baggage handling for over a century. The international framework for baggage checks was later formalized by the Warsaw Convention of 1929, which established criteria for issuing luggage tickets and set limits on carrier liability for lost or damaged bags under Article Four.
These tags offered minimal security and were easy to replicate, which became a significant concern following aviation security incidents. The bombing of Air India Flight 182 on June 23, 1985, was a catalyst for the industry, led by the International Air Transport Association (IATA), to form the Baggage Security Working Group. This group's work, chaired by John Vermilye of Eastern Airlines, led to the development and adoption of the automated 'license plate' system for baggage reconciliation, which was standardized by IATA Resolution in 1987. The first automated baggage sorting systems were developed independently by airlines in the 1980s, beginning with Eastern Air Lines at their Miami International Airport hub. Other carriers like United Air Lines, TWA, Delta, and American Airlines soon created their own proprietary systems. These early systems were not interchangeable and used barcodes differently, some representing three-letter airport codes and others two-digit sorting symbols. The lack of a common standard highlighted the need for an industry-wide approach, which emerged from the security-driven work of the Baggage Security Working Group in collaboration with Allen Davidson of Litton Industries.
The Modern Bag Tag and License Plate System
The contemporary bag tag is an adhesive strip printed on thermal paper, featuring a barcode using the Interleaved 2 of 5 symbology. This barcode represents a unique ten-digit number known as the license plate, which is the official IATA term for the primary bag identifier as defined in Resolution 740. The license plate number is the critical index that links the physical bag to the Baggage Source Message (BSM) sent by the airline's departure control system to the airport's baggage handling system. The BSM contains all relevant passenger and flight details, enabling automated sorting and reconciliation. The human-readable section of the tag displays key information for manual handling, including the passenger's name, flight number, destination airport code, and the license plate number itself.
The structure of the ten-digit license plate number is precisely defined. The first digit is a prefix with specific meanings, while the remaining digits identify the carrier and the specific bag. A first digit of '0' indicates a standard interline or online tag, '1' denotes a fallback tag used during system communication failures as per IATA Recommended Practice 1740b, and '2' is used for 'rush' tags for late or recovered luggage flying unaccompanied. Digits three through nine in the first position are not defined by IATA and can be used by carriers for internal purposes, such as indicating a million-series for tag numbers. The license plate always encodes a full ten digits in its barcode, though the human-readable version may show a shortened two-character airline code like 'BA' for British Airways, or a three-digit carrier code like '125'.
- Digit 1 (0): Standard interline/online tag.
- Digit 1 (1): Fallback tag for system failures.
- Digit 1 (2): Rush tag for unaccompanied luggage.
- Digits 1 (3-9): Reserved for airline-specific use.
- Human-readable format: e.g., BA728359 or 0125728359.
- Barcode format: Always the full ten digits.
Automated Sorting Technology and Performance
Automated baggage sorting systems rely on reading the barcode from bag tags as luggage moves through conveyor networks. These systems use in-line arrays of lasers or cameras positioned at key points to scan tags from multiple angles, as bags can shift and rotate during transport. Camera-based systems are increasingly replacing lasers due to their superior ability to read damaged, crumpled, or poorly printed barcodes using advanced software algorithms. A significant technical challenge is the placement of scanners below gaps in the conveyor belt to read tags on the underside, where dust and debris buildup can lower performance. Camera systems improve the likelihood of successful reads from this difficult position compared to lasers.
The key performance metric for these systems is the 'read rate,' or the percentage of barcode tags successfully scanned without manual intervention. Read rates for laser-based systems can be as low as 85 percent, meaning more than one in ten bags must be manually sorted. Camera-based systems typically achieve better read rates, up to 99.5 percent in ideal conditions. This improvement directly reduces labour costs and delays in baggage handling. Despite these advances, barcode technology requires a direct line of sight and can be hindered by physical damage to the tag, which has driven the industry to explore more durable alternatives like RFID.
| Technology | Typical Read Rate | Key Advantage | Key Limitation |
|---|---|---|---|
| Laser Scanner Arrays | ~85% | Established, lower initial cost | Poor performance with damaged tags, debris |
| Camera Scanner Arrays | Up to 99.5% | Better algorithms for damaged/folded tags | Higher complexity and cost |
Electronic Bag Tags and Specific Initiatives
The latest evolution in baggage tagging is the development of reusable electronic bag tags (EBTs). These devices typically use electronic paper (e-paper) displays, similar to e-readers, which can be updated wirelessly and require battery power only during data transmission. In 2013, British Airways began a trial of an e-paper tag that could be updated via Near Field Communication (NFC) from a smartphone app, where the phone would be held close to the tag. Other companies, like Fast Travel Global Ltd, have developed multi-airline compatible EBTs, such as the eTag, which uses Bluetooth Low Energy for data transmission from a supported airline's app.
Several airlines have launched distinct EBT initiatives with different technical approaches. Qantas introduced Q Bag Tags in 2011 for its domestic Australian network, distributing them free to Silver, Gold, or Platinum Frequent Flyer members or selling them for A$29.95. Unlike other EBTs, the Qantas tags lack a display and barcode, limiting their use to the Qantas domestic system. Lufthansa has been a leader in this space, launching an electronic tag in partnership with luggage manufacturer Rimowa in March 2016. On January 9, 2018, Lufthansa introduced the BAGTAG, marketed as the first fully secure, operational electronic bag tag with integrated RFID that can be attached to any suitcase. The main benefits driving EBT adoption are passenger self-control and ease-of-use, time savings by skipping check-in queues, improved read rates, and significant operational cost reduction for airlines over time.
- 2011 (Qantas): Q Bag Tags launch for domestic Australia. No display/barcode.
- 2013 (British Airways): Trial of NFC-updatable electronic paper tag.
- March 2016 (Lufthansa/Rimowa): First successful commercial launch of an EBT.
- January 9, 2018 (Lufthansa): BAGTAG introduced with integrated RFID.
- Fast Travel Global Ltd: Develops 'eTag' using Bluetooth Low Energy for multi-airline use.
Operational, Security, and Regulatory Functions
Beyond simple identification, the bag tag serves several crucial operational and security functions. The license plate system enables baggage reconciliation, a mandatory security process that ensures only bags belonging to passengers who have boarded the aircraft are loaded onto the flight. This protocol was developed directly in response to the Air India Flight 182 bombing and is now a global standard enforced through the link between the license plate and the Baggage Source Message. For flights within the European Union, bag tags are issued with distinctive green edges. This visual marker allows passengers arriving at another EU airport to proceed through the separate 'Blue Channel' or 'Green Channel' at customs, indicating they have nothing to declare, thereby streamlining the intra-EU travel process.
The information architecture of a standard bag tag is designed for both machine and human use. Key data points displayed in human-readable form include the passenger's last name and first name, the airline code and flight number, the departure time, and the IATA three-letter code and name of the arrival airport. This allows baggage handlers to manually sort bags if automated systems fail and assists passengers in identifying their luggage on a carousel and as proof of ownership when leaving the baggage reclaim hall. The integration of the tag's data with airline reservation and departure control systems creates a closed-loop tracking system from check-in to final claim, enhancing both security and customer service while limiting carrier liability to published tariffs and international agreements like the Warsaw Convention.
Technical Standards and the Future with RFID
The technical specifications for modern bag tags are governed by IATA resolutions and recommended practices. The core standard is defined in IATA Resolution 740, published annually in the Passenger Services Conference Resolutions Manual. This resolution details the format and use of the license plate number. IATA Recommended Practice 1740b further defines the use of fallback tags, which are pre-printed or demand-printed tags used when communication fails between an airline's system and the airport's baggage infrastructure. The barcode symbology, Interleaved 2 of 5, was chosen for its reliability and density, allowing the ten-digit license plate to be printed in a compact space. The barcode is often printed in two orientations or in a 'T' or 'orthogonal' shape to increase the likelihood of a successful read from any angle by automated scanners.
The transition towards RFID represents the next major phase of standardization. RFID tags contain a microchip and antenna, allowing them to be read from a greater distance and through obstructions, and to store more data than a simple barcode. As airports like Hong Kong International and Harry Reid International in Las Vegas demonstrate the efficacy of RFID systems, IATA's push for a common standard aims to avoid the interoperability problems seen with early proprietary barcode sorting systems. A global RFID standard would ensure that bags can be tracked effectively across different carriers and handling agents worldwide, reducing mishandling rates. The work to standardize RFID bag tags is ongoing, with the goal of creating a unified system that improves upon the limitations of optical barcode scanning.
Questions about Bag tag
Who invented the bag tag and when?
The bag tag was invented by John Michael Lyons of Moncton, New Brunswick, Canada. He received a patent for his 'separable coupon ticket' on June 5, 1882. His design featured a ticket with a passenger stub and a carrier portion that was inserted into a brass sleeve and attached to luggage with a strap. This invention established the basic model for baggage checks used by transportation carriers for over a century, combining identification, passenger claim, and carrier routing into one document.
What is the purpose of the ten-digit license plate on a bag tag?
The ten-digit license plate number is the official IATA identifier that uniquely links a piece of luggage to its passenger and journey data. It is printed in both barcode and human-readable form on the tag. This number is the index key for the Baggage Source Message (BSM) in airline systems, enabling automated sorting, baggage reconciliation for security, and tracing of lost bags. The first digit specifies the tag type, such as standard, fallback, or rush, guiding baggage system logic.
How do airport scanners read bag tags, and how accurate are they?
Airports use in-line arrays of lasers or cameras built into conveyor systems to scan barcodes from multiple angles as bags move. Camera systems are replacing lasers because they use algorithms to read damaged or folded tags more effectively. The success rate, or 'read rate,' varies significantly: laser systems can have read rates as low as 85%, while camera systems can achieve up to 99.5%. Bags that fail automatic reading are shunted to manual sorting stations, which adds labour and potential for delay.
What are the main types of electronic bag tags?
The main types of electronic bag tags include the British Airways trial tag from 2013, which is updated via a smartphone app using NFC technology. Another type is the multi-airline 'eTag' from Fast Travel Global Ltd, which uses Bluetooth Low Energy for updates. Airline-specific tags also exist, such as the Qantas Q Bag Tags introduced in 2011, which lack a display screen. The first fully operational launch was by Lufthansa and Rimowa in March 2016, followed by Lufthansa's BAGTAG in 2018, which incorporated RFID technology and could be attached to any suitcase.
Why are some bag tags green, and what does a 'rush' tag mean?
Bag tags with green edges are issued for flights departing from an airport within the European Union to another EU airport. This allows passengers to take these bags through the separate 'Blue Channel' or 'Green Channel' for 'nothing to declare' at Customs upon arrival. A 'rush' bag tag is identified by a license plate number that starts with the digit '2'. It is used for luggage that either missed its original flight or is recovered lost property being flown unaccompanied to be reunited with its owner. This designation helps prioritize the bag's handling within the automated baggage system. The license plate is the official ten digit code printed in barcode and human readable form on the carrier tag. The first digit in this code indicates the tag's specific purpose within the baggage handling system.
How is RFID technology changing bag tags?
RFID technology is changing bag tags by embedding a radio frequency identification chip that can be read without requiring a direct line of sight. This overcomes key problems with traditional barcodes, which cannot be scanned automatically if they are obscured, crumpled, or damaged. Airports such as Harry Reid International Airport in the US and Hong Kong International Airport have installed comprehensive RFID systems. The International Air Transport Association is working to standardize RFID bag tags globally. Some airlines have started using these RFID embedded tags to improve read rates and tracking accuracy. The move towards RFID aims to reduce the operational delays and extra labour caused when barcode tags fail to be read by automated systems.
Sources: Wikipedia and current public reporting, checked by the Your Space Hamilton desk. Last updated 2026-10-31.
