VS will only upgrade if they are overbooked in Economy, even then it goes off Frequent Flyers first the highest to lowest fares. The best way to ensure an upgrade as previously posted is to pay for it. The majority of airlines my airline included have no time for the 'it's our honeymoon can we have an upgrade please?' line. It's basically down to product protection. Gone are the days where an airline will upgrade you gratis just because the seats in the next class of service are empty, its not in their interest as they are'nt gaining any further revenue...it's all down to £££ these days.