I'm looking to get back into photography, particularly aviation photography.

Any recommendations for a good, relatively cheap SLR?

I had a cannon 350D previously, so would prefer to stick to Cannon if possible. I'm looking at the 1200D, which looks decent.

Anything else worth considering?

1200D or 750D are both great cheap cameras. Later down the track if you want to get a lens with sharper images, you can get a 70-200 f/2.8 or 100-400 Mk2. Both of which would be great on either of those bodies.

What's the difference between the 1200D and the 750D ranges?

I've got a 75-300 lens at present, although I might replace it with a new 75-300 IS.