As noted by
The _Banking_Scot the individual airline earning pages at ba.com are a good place to find this information. From the section for Japan Airlines:
At a glance
- Included: Japan Airlines (JL), JAL Express (JL), J Air (JL), and Japan Transocean (NU), Japan Air Commuter (JAC) and Hokkaido Air System (HAC). (Flights operated by JAC and HAC will have JL flight numbers.)
- Minimum Avios: No minimum.
- Avios tier bonus? Yes, 25% extra for Bronze, 50% extra for Silver and 100% extra for Gold Members. (Avios Tier Bonus isn't applicable on JL Domestic flights, only on JL International flights.)
- Collect Tier Points? Yes (discount economy (World Traveller) flights will earn fewer Tier Points depending on the fare purchased).
https://www.britishairways.com/conte...-avios/flights