When playing the game on WiFi, there is a letter near your name. If you just started playing on WiFi, your letter will be at Z. The letters represent your rank as a pilot, with "Z" being the lowest rank and "A" as the highest rank. The only way to increase your rank is to collect the stars from destroyed enemy ships. Each star give you around 8% to 9%. When you reach 100%, your letter will increase to the next level. However, the only way for you to get all the experience from each star is to be in first place after each match. If you finish in second place, you will not receive the experience.