Originally Posted by
NWIFlyer
EI, assuming this is a wet lease and therefore the responsibility is theirs, is a community airline, so either EC or UK versions of the law can apply.
Technically this is a flight sold by EI but operated by Aer Lingus UK, a UK carrier (who have further wet leased BA as they don’t have any A320s of their own). All of whom are owned by IAG. If that makes sense.