Canadian patent filing, "IMPROVEMENTS IN BAGGAGE CHECKS AND COUPON TICKETS", Patent Number 14911Archived November 4, 2016, at the Wayback Machine, Library and Archives Canada
bagtag.com
"BAGTAG". BAGTAG | the ultimate device for travel with your baggage. Retrieved May 1, 2018.
IATA Passenger Services Conference Resolutions ManualArchived February 1, 2014, at the Wayback Machine (PSCRM), 33rd Edition, Resolution 740, Secrion 5.1.2; however, this source does not reference how airlines commonly use that digit. It only states that values three through nine are for "interline and on-line use".
Canadian patent filing, "IMPROVEMENTS IN BAGGAGE CHECKS AND COUPON TICKETS", Patent Number 14911Archived November 4, 2016, at the Wayback Machine, Library and Archives Canada
IATA Passenger Services Conference Resolutions ManualArchived February 1, 2014, at the Wayback Machine (PSCRM), 33rd Edition, Resolution 740, Secrion 5.1.2; however, this source does not reference how airlines commonly use that digit. It only states that values three through nine are for "interline and on-line use".