Does anyone know if aircrete has been used as a stucco or exterior finish application over a traditional concrete wall surface? Thanks for any input!

Using large tile on an aircrete slab shouldn't crack if the underlying soil isn't expansive clay or unstable and/or not properly compacted. When tile cracks on concrete it is usually because the ground underneath has moved and buckled the slab.

@AlexandraKriz , I'm wondering if you have had any success since the last post? I just joined the forum today and came across your post. I may be able to give you some advice as I've been a builder for 35+ years, God bless!

I think you would have two options, pour another thin layer of much denser aircrete over the normal aircrete slab, or lay some cheap floor tile over the the slab. I would use a larger tile size to help distribute the weight over a bigger area.