AF4091 and AF4095 flight numbers: why?

Old Aug 25, 19, 12:03 pm
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FM
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Question AF4091 and AF4095 flight numbers: why?

Hello and bonjour and sorry for not posting more often... Can I ask a quick question?

Last week on 19th August, both AF6 and AF10 from CDG to JFK were delayed by several hours. Rather than indicating that the corresponding return flights (AF7 and AF11) would be delayed as well because of the proverbial "late arrival of aircraft", Air France cancelled AF7 and AF11 and renumbered the flights respectively AF4091 and AF4095 showing an amended departure time reflecting the expected delay. Both AF4091 and AF4095 were then operated by the A380s who had landed in JFK as AF6 and AF10.

A quick search on AF website or on FlightRadar shows that AF7 and AF11 were indeed cancelled - but that AF4091 and AF4095 ran approximately on time.

As far as I am concerned, I was initially booked on AF11 but was offerred a seat in AF4091 (ex-AF7), which I accepted and which made me reach CDG early enough for my connecting flight - so all fine for me.

However and purely out of curiosity I was wondering what AF gained from this cancellation / renumbering exercise? Any impact on the compensation rules? or on the statistics? or anything else?

Thanks and safe travels.
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Old Aug 25, 19, 3:30 pm
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This is done to avoid to have 2 flights the same day with the same flight number (the delayed one and the regular flight of the day). Outside North America, AF just add a letter to the flight number (e.g. AF244A), but this letter is incompatible with DL systems. So in North America, AF just give a completely different flight number in the AF4XXX bucket.
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Old Aug 26, 19, 6:55 am
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AF4XXX numbers are also used for charter flights.
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Old Aug 26, 19, 3:50 pm
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Originally Posted by Goldorak View Post
This is done to avoid to have 2 flights the same day with the same flight number (the delayed one and the regular flight of the day).
Thanks Goldorak!

Then on 19th August, this was perhaps done as a precautionary measure for AF7 which departure time was initially 19:00 and became 21:45 under AF4081 (effective departure time: 22:47) - still on the same day.
For AF11, it's more obvious. Initial departure time was 21:55, rescheduled to 00:45 on Day+1 indeed as AF4085 (effective departure time: 01:40!).
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Old Aug 28, 19, 3:35 pm
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19:00 JFK is 23:00 UTC (same day). 21:45 JFK is 01:45 UTC (next day).

These things are measured in UTC, not local time, for operational/ATC purposes.

That said, these things are also measured in local time for staff/pax/website purposes. Which is why the later flight was also renumbered.
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