Bonus options:
     Successfully  complete  all 18 missions, then save the game. Load
the  saved  game to unlock the following new options at the main menu.
The  "Special  Continue"  option allows the entire game to be replayed
with  new  fighters  and  weapons,  plus the money earned in the first
game.  The  "Free Mission" option allows any mission to be played. The
"Trial  Mission"  option  allows the game to be played in either score
attack  or  time attack modes. The "Scene Viewer" allows FMV sequences
to  be played. The "Music Player" option allows any of the 36 songs in
the game to be played.

All aircraft:
     Use the following steps to unlock all aircraft, including special
colors. First, acquire an aircraft by destroying it in battle. This is
easy,  except  for  three  aircraft.  Forget  the  ground  targets and
dogfight  instead, which is the true nature of an ace. You can acquire
three  different  paint  schemes  for  each aircraft. Two of the paint
schemes  can  be acquired by destroying that color aircraft in battle.
To  acquire the special brightly colored third aircraft, you must find
and  kill  the  pilot  flying it. On each level of the game there is a
single  hidden  aircraft (eighteen total hidden aircraft). Each one of
these  aircraft  has  a  specific  pilot. 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. For example, "S-37A SMIRNOVA." The
hidden  aircraft  will  not  show up on radar until you get nearby. On
radar,  the  aircraft  will  be  marked with a red triangle instead of
yellow.  Each  hidden  aircraft  is  always in the same place on their
specific  level.  This is always in an empty spot on the map away from
the  main  combat  zone.  The  aircraft  can usually be found directly
behind  the  main  combat  zone.  Last  but  not  least  are the three
remaining  aircraft. To acquire the Yellow Squadron fighter (SU-37) of
your  nemesis  Yellow-13,  you  must kill all of the pilots with names
flying the special colored aircraft (eighteen total).

Unlock X-02 Stealth:
     To  unlock  the  X-02 Stealth, get an "S" rank on all 18 missions
under normal mode.

Unlock Tiger Striped F-4E:
     You  can  get  the Tiger Striped F-4E by completing the game once
under  any  difficulty setting, then using the Sp. Continue option. To
unlock  the  second  X-02  aircraft  you  must  get an "S" rank on all
eighteen missions under the hard difficulty setting. The third X-02 is
unlocked  by  getting  an  "S" rank on all eighteen missions under the
expert difficulty setting. Information in this section was contributed
by Robert Bell.

     Alternate  colors:  Successfully  complete  the game in ace mode.
Note:   You  may  also  need  to  obtain  S-class  for  all  missions.
Information in this section was contributed by Peter Hsu.

Hint - Aircraft list:
     The following is a complete aircraft list (in order): Information
in this section was contributed by Golgo-13.

F-4E (fighter)
Blue Camo
Tiger Stripes 
F-5E (fighter)
Sky Camo
Gray Camo
Sea-Green (Wang) level 1 
F-16C (fighter)
White w/ Blue Stripes (Tempel) level 3
A-10A (attacker)
Camo
Desert Camo
Silver (Ciffred) level 2 
MIR-2000 (fighter)
White w/ Blue Stripes (Rigaux) level 4 
F-14A (fighter)
Black (LEVY) level 6 
TND-ID5 (attacker)
Green Camo
Yellow Stripes (De Vico) level 7 
F/A-18C (multirole)
Desert Camo
Yellow (Vrisala) level 8 
F-15C (fighter)
Green-Gray Camo
Blue-Silver (Tuttle) level 9 
MIG-29A (fighter)
Red (Mrkos) level 5 
F-117A (attacker)
Black Camo
Winter Camo (Kwee) level 16 
EF-2000 (fighter)
Brown Camo
White with red stripes (Olmstead) level 15 
R-M01 (multirole)
White with blue stripes (Faye) level 10 
F-15E (multirole)
Blue Tiger Stripes (Gunn) level 13 
F-2A (attacker)
White with red stripes (Urata) level 12 
SU-35 (fighter)
White with blue and red stripes (Neujmin) level 11 
F-22A (fighter)
Gray (Abell) level 14 
SU-37 (fighter)
Gray Camo with yellow wing tips (Yellow Squadron)
F-15ACTIVE (fighter)
White with blue andred stripes (Halley) level 17 
S-37A (fighter)
Silver Camo (Smirnova) level 18 
X-02 (multirole) (last aircraft)