Mission 27 tunnel glitch.

On mission 27, "Aces", you are able to complete the level without having to traverse the entire tunnel. Here is what you do:
Play the level as normal until the tunnel is opened. Instead of flying into the entrance, fly North towards the exit of the tunnel. It should be directly North of the entrance.
Once you find it, approach it from the side so you can just barely enter the tunnel and turn back out. If done correctly, Bartlett will say"I'm right in front of you Kid. On the count of three, break right."
Once he says that, fly back to the entrance of the tunnel, and enter it. Fly through it as you normally would, but when you destroy the target inside, the cut scene of the Razgriz exiting the tunnel will start, and the level will end.
Note: You can not get the special colored aircraft inside the tunnel if you do this.

Contributed By: Colonel_Asshat.

Unlocking Aircraft

Each flyable aircraft in the game has a small horizontal bar underneath the aircraft name on the aircraft selection box. This is the 'Kill Bar'. In order to get the other variants of certain aircraft that are part of a family, you'll need to fill this all the way up by destroying enemy targets. You must gain a certain amount of points (cumulative) with an aircraft in the family of the plane you want. The amount of points you need to earn will differ with each aircraft. For the stronger and better planes, you will need to earn more points to unlock it's new variant. After filling up the Kill Bar of the desired plane, the next aircraft in the aircraft family will become available for purchase at the 'Buy' screen. Kill Bars can be filled up in both Campaign and Free Mission mode.

The aircraft that are the first variants of their families are obtained by completing certain missions in the game, and will become available after completing them.

NOTE: Aircraft that have only one variant in the aircraft family (ex. MiG-29A, MiG-1.44) will have their Kill Bars already filled up when you buy them, so you do not have to fill up their Kill Bars at all. The last plane in each family will also have its Kill Bar filled up already.

Contributed By: retributiontomcat.

Special Commemorative Message

Upon completing every mission on the Ace Difficulty while obtaining an "S" Rank, you'll recieve a special message from the developers during your final debriefing.

Contributed By: Mobius2004.

Defeating the 8492nd Squadron During "8492"

In order to obtain an "S" Rank on this mission, you must engage and destroy members of the 8492nd Squadron. Upon a first glance, this may prove difficult as these enemies use ECM almost exclusivley. In order to prevent this, destory the E-767 Jammer Aircraft accompanying the 8492nd.

The E-767 is the first enemy aircraft targeted once the 8492nd Squadron appears. Be careful to evade the initial barrage of missiles and destory the jammer. Giving your Wingmen the ATTACK Command while the facing the target is most likely easier than trying to destory the plane yourself.

Contributed By: Mobius2004.