Overselling is very common, especially with certain airlines on certain routes. For example, British Airways heavily oversells their LHR-USA flights in busines

Overselling is very common, especially with certain airlines on certain routes. For example, British Airways heavily oversells their LHR-USA flights in business, premium economy, and economy. This often means that business class passengers get upgrades to F, premium economy fills business and if necessary, they can bring economy passengers forward. This strategy works for them because they have a ton of very large planes on some routes that can go through spurts of heavy loads.