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I'm currently experimenting to find a slightly blueish grey for the underbelly of a flyer I'm painting. Basically I'm aiming for something like on the Hawker Hurricanes in this picture:

I got some Ulthuan Grey here, but it is "just" grey. I also considered Fenrisian grey which seems a bit more blueish but is a bit too dark for my taste.
Now I have a bottle of Pylar Glacier (a very light blue contrast color) lying around and was wondering: has anyone here on dakka tried mixing Citadel air and contrast colors to use them in an airbrush? I don't mean applying contrast over air color, but really mixing the two and applying them together?

Yeah you can mix contrast and non-contrast. Obviously you lose the contrast effect but sounds like you're expecting this.

I think the official colour you want is almost a grey-turquoise. Sky Type S - Vallejo Air BS210

As long as both water-based mix away!

I mix color inks quite a bit while painting with acrylics. Sometimes speed-paints too.

So I tested it out and it worked... in the end.
Mind you I wanted to use Pylar Glacier as I had it andnever really found a use for it, but it turned out that contrast is so low on pigments that I put about 3/4 of a bottle into half a bottle of Ulthuan grey and it barely changed. Than I put in just a little bit of thalassar Blue and Bamm! Completely blue. To the point I had to add Ulthuan grey again.
In the end I arrived at something a little brighter than Baharoth Blue which I was satisfied with.
The result applies just like a normal Airbrush color.

Interesting experiment.
Looks like it worked out well.