Putting a fixed wing aircraft into the game is unusual for Tiberian Sun.

You can make a copy of the Orca, or Harpy.

Then use tags like :

Rollangle=70
Pitchangle=2


If you make it into a dropship by adding IsDropship=yes, then
the Rollangle and Pitchangle tags become useless. However, by doing
so you can make it land like a fixed wing aircraft by adding "SlowdownDistance=2000" and "FlightLevel=800".


Making a copy of the proton weapon and then adding a different projectile and warhead makes a flyby weapon that is perfect for fixed wing aircraft.

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XX=FIGHTER

; Fighter Aircraft
[FIGHTER]
Name=Prototype
Prerequisite=AFLD
Primary=Hellfire
Strength=200
Category=AirPower
Armor=light
TechLevel=5
Sight=10
RadarInvisible=no
Landable=yes
MoveToShroud=yes
Dock=GAHPAD,NAHPAD
PipScale=Ammo
Speed=25
PitchSpeed=.16
Owner=GDI,Nod
Cost=1000
Points=20
ROT=5
Ammo=5
Crewed=yes
GuardRange=30
Explosion=TWLT070,S_BANG48,S_BRNL58,S_CLSN58,S_TUMU60
MaxDebris=4
VoiceSelect=30-I000,30-I002,30-I004,30-I006
VoiceMove=30-I014,30-I016,30-I018,30-I022
VoiceAttack=30-I022,30-I030,30-I034,30-I036
Locomotor={4A582746-9839-11d1-B709-00A024DDAFD1}
MovementZone=Fly
ThreatPosed=20 ; This value MUST be 0 for all building addons
DamageParticleSystems=SparkSys,SmallGreySSys
AuxSound1=ORCAUP1 ;Taking off
AuxSound2=ORCADWN1 ;Landing
RollAngle=70
PitchAngle=2
FlightLevel=800
SlowdownDistance=2000
IsDropship=yes ;either banking turns or soft landing your choice