For me, booking with AY is a plus in that I have generally found them great to deal with for changes &c. For a simple itinerary changes I have simply phoned that in and they have sent through the revalidated ticket within a few hours. A re-route took a little longer - couple of days - but was processed efficiently and knowledgeably. In both cases not as instant as, say, QF but if I never have to deal with QF again I would be a very happy person.