Last but not least are the three remaining aircraft. The aircraft can usually be found directly behind the main combat zone. This is always in an empty spot on the map away from the main combat zone. Each hidden aircraft is always in the same place on their specific level. On radar, the aircraft will be marked with a red triangle instead of yellow. The hidden aircraft will not show up on radar until you get nearby. When you see the aircraft in front of you and lock on, it will display the pilot's name next to the aircraft name and lock on square. Each one of these aircraft has a specific pilot. On each level of the game there is a single hidden aircraft (eighteen total hidden aircraft). To acquire the special brightly colored third aircraft, you must find and kill the pilot flying it. Two of the paint schemes can be acquired by destroying that color aircraft in battle. You can acquire three different paint schemes for each aircraft. Forget the ground targets and dogfight instead, which is the true nature of an ace. First, acquire an aircraft by destroying it in battle. Use the following steps to unlock all aircraft, including special colors. White with blue andred stripes (Halley) level 17 Gray Camo with yellow wing tips (Yellow Squadron) White with blue and red stripes (Neujmin) level 11 White with red stripes (Olmstead) level 15
The following is a complete aircraft list (in order): Successfully complete the game under the expert difficulty setting to unlock the ace difficulty setting.