I don't think Virgin Australia is serious about a move to Melbourne. So expensive to uproot and re-locate a company like an airline, compared to a law firm that's just a bunch of offices for example. Plus they would lose so many staff who live in sunny relaxed Brisbane, have kids in school there and probably extended family there, and would NOT want to swap that for Melbourne, so Virgin would need to go through the very expensive exercise of finding and hiring and training up new staff. No, I think Virgin is just floating this idea to see what deal the QLD government is willing to cut them. It's a hollow threat.