I don't know of any anywhere that specialize in diecast aviation.
Model Collector and
Diecast Collector, both published in the UK, used to be the best English-language diecast magazines I was familiar with back in the 1990s. I believe both are still being published, but I do not know for certain. Herpa publishes a German language magazine, and I think there are a couple of good German and Italian language magazines focused on diecast automobiles.
Back in the day, there was an excellent little diecast aviation publication called "The Plane News", but it's long gone.