I am a long time AT2 player and love these games. AT4 has the potential to be awesome but is ruined by the AI. The AI is way too hard to beat even on easy. Their airlines grow at almost 50% faster rate than yours. Also, the AI needs to be adjusted with their names and their core city. For example Asian Air shouldnt have a core city in Barcelona. I also liked the option to set up new "hub" cities as in AT2. New additions like the "stop over" option is cool. More cities are great but may need to add more in other areas such as Mid-America. Adding a free play mode would be cool so that the game doesnt end at a specific year.