Join Date: Sep 2005
Location: HEL
Programs: AY Platinum, TK Elite, BT Executive, AA, BA, SK, DL, NT, WB + hotels
Posts: 10,307
EC261 always places responsibility on the operating carrier, which would be AY.
OTOH, I've read of cases where AY+AA itineraries from Europe to the US have been compensated by AA, as it was the last carrier.