Upgrade inventory - opening up differently depending on sector?
Just wondering whether anyone has experience something similar?
Two NRT - FRA trips via DXB within a couple of weeks. Both times, DXB-FRA sector is available for upgrade (Y to J) right away, while NRT-DXB only opens up a couple of days before, even though there was huge availability on Narita sector to begin with. As a matter of fact, one of the flights was on New Year's Eve and maybe 4-5 passengers in J in total.