I noticed this when I was on Delta's website -- newcomer link: http://www.delta.com/traveling_checkin/flight_status_updates/advisories/pet_policy/index.jsp [nonactive]
And I wasn't sure if it had been posted here, but I thought if it hadn't it was probably a useful piece of information given that the vaste majority of planes that Delta uses across the Atlantic are 767 (they fly some 777, but 95% of them seem to be 767).