Originally Posted by
RealHJ
Wouldn't be the first time. It's not uncommon for the DL codeshare to exist for a canceled flight, or for the actual flight schedule to be changed, sometimes by a few hours, but the DLxxxx codeshare to still have the old time. (Same also for the other airline actual flight in DL systems. DL has been known to have old arrival/departure times and not to update it when the operating carrier does, thus resulting in missed flights by pax and misconnects. That's why you always have to check the authoritative operating airline itinerary and schedules, esp. in case of codeshares.)
This. Prior to Covid I used to travel to BKK once a year, and would frequently book 6+ months in advance. Booked via DL, but codeshare flight DLXXXX operated by KE out of ICN. It was not uncommon to see the times (or aircraft type) change on the KE website, but the DL website wouldn't reflect the change until weeks later. Thankfully this was always resolved around a month or so prior to departure, but could have been an issue had it not made its way through the system.