A bit off topic, but was a specific reason given as to why some JAL/Star Alliance routes were kept at Narita, given its reduced efficacy as a connecting hub? Some examples:
- JAL: BLR, SEA, YVR, SAN
- ANA: MAA, PER
- Air Canada: YVR
- Air India's NRT-DEL flight (AI307/308)
IMO the aforementioned stations are lower yielding, so it would have been considered a waste of a valuable Haneda slot, if it had been assigned to somewhere like Perth or San Diego where traffic is less premium-heavy. Also, Canada is a low-yielding destination anyway.
This is all from a pre-COVID-19 standpoint.