its standard practice with Full Service airlines to overbook flights by up to 10% normally, they base it on that not everyone shows up for their flights r changes their travel plans last minute which can be the case with business passengers. I don;t know of any loco that overbook but most of the larger airlines do. I know for a fact that EI no longer overbook due to an excessive amount of compo they had to pay out to passengers one year at JFK airport. Its just one of those things and until the B773ER is operating DUB-DXB i would say get used to it cos it will probably happen most days between now July1st. Its just one of those practices that can sometimes save airlines money and sometimes cost them.