My Airline Die-Cast Model Collection - Worth Expanding?

So I've been collecting die-cast model planes for a few years now, mostly 1:400 scale. Got a mix of Gemini Jets and Phoenix Models up on my shelves. Recently snagged a rare British Airways Concorde model and now I'm itching to add more vintage stuff. I love the detail on these things!

I'm thinking about diving into other scales, maybe 1:200 or 1:500, but not sure if it's worth it. What do you folks think about mixing scales in a collection? Does it mess with the overall look? Also, any recommendations on must-have models? Looking for something with a bit of history.

Would love to hear how you all display your collections too. Running out of shelf space here! Anyone tried those fancy glass cabinets? Let me know!

Mixing scales can be a bit tricky if you're going for a cohesive look, but it also adds variety, which can be cool. I have a couple of 1:200 models alongside my 1:400s, and they definitely stand out more. If you're into history, check out some old Pan Am models or the early Boeing 707s. As for display, glass cabinets are awesome for dust protection and showcasing details. IKEA's Detolf is popular. But yeah, space gets tight fast!

I've got a mix of scales in my collection, and it doesn't bother me at all. Adds a bit of character, I think. Plus, some planes just look better bigger. If you're into history, maybe look for a Pan Am 747 or an old DC-3. Those definitely have stories to tell. As for display, glass cabinets are fantastic if you can find the space. Keeps the dust off and makes your collection feel like a mini museum. But yeah, I've run into the shelf space issue too. It's a constant battle!