Here are categories that will be used at NordicCon 2019:

Juniors
A-1
Ages 9 and Under
A-2
Ages 10 to 13
A-3
Ages 14 to 17
Aircraft
B-1
WWI and Bi planes (All Scales)
B-2
1/48 WWII Axis Single Engine
B-3
1/48 WWII Allied Single Engine
B-4
1/72 Axis Single Engine
B-5
1/72 Alleid Single Engine
B-6
1/48 WWII Multi Engine
B-7
1/72 WWII Multi Engine
B-8
1/48 Jets Korea to Present
B-9
1/72 Jets Korea to Present
B-10
Helicopters (All Scales)
B-11
Post WWII Military Prop (All Scales)
B-12
1/144 and Smaller
B-13
1/32 Scale
B-14
Civilian (All Scales)
B-15
Miscellaneous Aircraft (Gliders, Drones, Rocket Powered, Etc)
Military Vehicles
Figures
D-1
54mm and Smaller
D-2
70mm and Larger
D-3
Bust
D-4
Sci Fi and Fantasy
Ships
E-1
1/600 and Smaller
E-2
1/350 to 1/500
E-3
1/200 and Larger
E-4
Submarines
Automotive
F-1
1/18 and Larger
F-2
1/32 and Smaller
F-3
1/20 to 1/25 Factory Stock
F-4
1/20 to 1/25 Street Rods (1948 and Older)
F-5
1/20 to 1/25 Customs
F-6
1/20 to 1/25 Competition Closed Wheel
F-7
1/20 to 1/25 Competition Open Wheel
F-8
Trucks
F-9
Motorcycles
F-10
Straight Line Competition
F-11
Street Machines (1949 and Newer)
F-12
Rat Rods
Sci-Fi
G-1
Out Of The Box
G-2
Major Conversion/ Scratch built
G-3
Gundam
Real Space
H-1
All
Dioramas
I-1
Military Subject
I-2
Non military Subject
Miscellaneous
J-1
All
J-2
Trifecta
J-3
Collections
J-4
Scratch built

 

You can download a complete list of categories from HERE.