I'm just like you, but the other way around
I mostly do airplane models and I build AFVs only to take a break from wings and bombs.
There are a lot of guys who like their aircraft as dirty as possible but the problem is these darn crew chiefs that love their aircraft so much that they take good care of them
(these guys are terrific)
So I would nuance a little the difference, IMHO, an AFV is very easily seen dirty because it evolves in a dirty environment. The air is clean and most of the time, the aircraft stays clean too - altough navy aircraft becomes dirty quite easily.
Still we weather our airplane models with the same techniques most of you guys are using: heavily diluted paint in the panel lines, drybrush, pastels, colour pigments, you name it. The techniques are quite often the same but more nuanced on the airplanes due to realism contraints.
Here are some pix of models I did in both categories:
Revell 1/32 tornado
Tamiya 1/48 skyraider
tamiya Tiger diorama 1/35
My current unfinished project
Happy modelling - whatever you model