Standby87 From Switzerland, joined Jul 2001, 536 posts, RR: 3 Posted (6 years 2 months 3 weeks 6 days 8 hours ago) and read 39167 times:

Can anyone tell me how to translate a ticket number?

Example - one of my own E-Tickets edited slightly

724 2117 777 256

I know :

724 = IATA 3-digit "Ticketing Plate" code for Swiss International Airlines.

I thought:

21 = Electronic Ticket, or maybe that's just Swiss procedure

The rest of the numbers I don't know, but I know ranges are allocated (how??) to each GDS and each Sales Office. I smell an IATA agreement of course...

The last of the 13 digits above is a Check Digit.
Take the leading 12 digits, divide by 7 and the remainder is the 13th digit.

What else is standard?
Have I got the check-digit screwed up?

Ah, Mr Google has turned up with an entire Book on Check Digit calculations:

"Identification Numbers and Check Digit Schemes"
By Joseph Kirtland

If anyone has a quick and ready guide, please let me know!

When I was issuing paper tickets manually many years ago, which I did for my first 3 years in the airline industry, apart from the 3-digit IATA accounting code at the beginning identifying the issuing airline, and the final check digit, if memory correct the first digit after the accounting code matched the number of flight coupons in the ticket form being used (1, 2 or 4 at the airline I worked for), and the remainng 8 digits were just sequential serial numbers as on any other type of ticket or document requiring a unique number.

In your example above, the first three digits of the document number (211) indicate the type of form. For example, a trip pass, an MCO, an automated ticket, and a PTA would all have their own unique, three digit form number. By looking at the first three digits of a document number, an agent could identify the type of document. The remainder of the number (7 777 256) is the serial number.

Cragley From Australia, joined Jul 2004, 428 posts, RR: 0
Reply 3, posted (6 years 2 months 3 weeks 5 days 23 hours ago) and read 39041 times:

001 = AA
005 = CO
006 = DL
012 = NW
014 = AC
016 = UA
027 = AS
037 = US
041 = JQ
044 = AR
045 = LA
047 = TP
050 = OA
053 = EI
055 = AZ
057 = AF
064 = CZ
072 = GF
074 = KL
075 = IB

Ha763 From United States of America, joined Jan 2003, 3666 posts, RR: 5
Reply 4, posted (6 years 2 months 3 weeks 4 days 20 hours ago) and read 38868 times:

Quoting Standby87 (Thread starter): The last of the 13 digits above is a Check Digit.
Take the leading 12 digits, divide by 7 and the remainder is the 13th digit.

N6168e From United States of America, joined Sep 2007, 48 posts, RR: 0
Reply 6, posted (6 years 2 months 2 weeks 2 days 14 hours ago) and read 38655 times:

Quoting Standby87 (Reply 5): It's a Modulus 7 check, so it can never be Zero because there's no remainder 0 case when you divide by a prime number 7?