Originally Posted by NWIFlyer

^. Now you've got the miles confirmed in your A3 account, do the true FT thing and double-dip by crediting the BA flights to a OneWorld FFP!

I would suspect you'll probably have to threaten, and maybe even issue, legal proceedings against ET before they'll pay your EC261. Getting enforcement against a non-EU airline where their regulatory authority may not be so quick to enforce EU law has got to be harder than dealing with an EU-registered airline.