Iata validating carrier
IATA airline designators, sometimes called IATA reservation codes, are two-character codes assigned by the International Air Transport Association (IATA) to the world's airlines.The standard is described in IATA's Standard Schedules Information Manual and the codes themselves are described in IATA's Airline Coding Directory.Determination of the VC will depend on the nature of the offices which performed the first issue and the reissue.After any reissue or revalidation, the validating carrier of the ticket will now be automatically set.
Fields may be single item (one allowed per record) or multi-item (more than one allowed).
(Both are published twice-annually.) Airline designator codes follow the format xx(a), i.e., two alphanumeric characters (letters or digits) followed by an optional letter.
Although the IATA standard provides for three-character airline designators, IATA has not used the optional third character in any assigned code.
This is because some legacy computer systems, especially the "central reservations systems", have failed to comply with the standard, notwithstanding the fact that it has been in place for 20 years.
The codes issued to date comply with IATA Resolution 762, which provides for only two characters.