To unlock expert difficulty, complete the game once.

You can unlock each plane in the game, save the two most powerful, by clearing the game once through on Normal difficulty. The two strongest craft are thereafter unlocked by completing the game on Hard and Expert difficulties.

Below are a list of planes that can be unlocked in Normal difficulty. Simply defeat the mission listed for the corresponding planes.

• Default - F-16C Fighting Falcon
• Mission 4 - A-10-2 Thunderbolt / Mirage 2000
• Mission 5 - Panavia Tornado
• Mission 6 - F-14D Tomcat / F-2A / FA-18 Super Hornet
• Mission 8 - Sukhoi 33 Flanker
• Mission 9 - F-15E Strike Eagle / Rafale M
• Mission 10 - F-117 Nighthawk
• Mission 12 - EU Typhoon
• Mission 13 - F22A Raptor / Sukhoi 47 Berkut

To unlock SP GamerPicture, beat the game once through on Ace Difficulty.

To unlock a new game feature (called Ace of Aces), simply complete the game on normal difficulty or hard difficulty.

Here's how you unlock new paint schemes. Complete the game once through on Normal mode, and unlock the Estovokian scheme. A third paint scheme can be unlocked by shooting down the enemy aces found only in Expert and Ace difficulty modes.

To unlock Ace Difficulty, beat the game once through on Expert Difficulty.

To unlock a new game feature (called New Game SP), simply complete the game once on a difficulty setting of your choice.

To purchase the CFA 44 Nosferatu, you must first beat the game on Hard difficulty (or higher). After beating the game on that setting, you can purchase the plane for $230,000.