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Is there a global maximum number of flight codes a specific flight can have? If not, is the flight operating as the highest number of codes simultaneously known?

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As far as I can tell, there seems to be no IATA or ICAO rule regarding the maximum number of codeshares a flight may be marketed under. I imagine there must be a technological limitation at some point, but having seven or eight codeshares is not terribly uncommon, and flights with a dozen or more have been reported in discussions at FlyerTalk and at Airliners.Net, for example.

There is probably a way for someone with GDS access to deduce the most-codeshared current flight. Flight numbers and codeshares change frequently, so that would be the only definitive way, and only for a period of weeks at best. But the FT thread suggest SYD/MEL-AUH; today's schedule on FlightStats.com indeed turns up two Etihad flights with 14 and 12 codeshares respectively, more than any other city pair I tried:

  • Etihad EY 455 SYD-AUH = A3 1915, AB 4071, AF 3821, AZ 3925, B2 355, EI 8055, HM 5105, JU 8583, KL 3939, KM 2122, ME 6637, NZ 4255, S7 4606, VA 7093

  • Etihad EY 461 MEL-AUH = AF 3823, A3 1911, AB 4055, AZ 3923, B2 361, HM 5101, JU 8581, KM 2158, NZ 4261, KL 3941, ME 6639, VA 7095

The best I could do in the domestic US market was a 10-codeshare ORD-ATL Republic flight:

  • Republic YX 4289 ORD-ATL = AA 4289, AB 4707, BA 8420, EY 3114, GF 6792, IB 7186, MH 9592, QF 4866, RJ 7242, US 8523

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