Try this:
Extract the FLIGHTENGINE.INI from the FlightData.cat and change the following lines -
[LowDetailOption]
HorizonDistance=45000.0
DetailMeshSize=2
DetailLevel=0
WaterEffect=0
NoiseTexture=0
MaxTextureRes=1024 <----
[MedDetailOption]
HorizonDistance=50000.0
DetailMeshSize=2
DetailLevel=1
WaterEffect=1
NoiseTexture=0
MaxTextureRes=2048 <----
[HighDetailOption]
HorizonDistance=60000.0
DetailMeshSize=3
DetailLevel=2
WaterEffect=2
NoiseTexture=1
MaxTextureRes=0 <----
[unlimitedDetailOption]
HorizonDistance=75000.0
DetailMeshSize=4
DetailLevel=2
WaterEffect=2
NoiseTexture=1
MaxTextureRes=-1 <----
Save and place the new archive in the "Saved Games" Flight folder. Next and most important is to reduce the size of plane's skins by using a graphic program like Photoshop. I'm almost sure that, in the F-102 case, this won't be necessary once the files are in 1024X1024, wich is a rather small size for the game engine. Cheers!!