Yes, the Bose two-prong adaptor works for Etihad (A380, 777) - Etihad A320 doesn't need adaptor, just plug single audio jack into the only hole it'll fit. Can't confirm for other aircraft types in Etihad's fleet, but I've yet to find an aircraft (on any airline flown) where the direct single prong or plug-in via the adaptor hasn't worked.