I seek your knowledge, Photography experts.

Here’s the scoop, my camera equipment currently consists of an iPhone 5s. That’s it. I don’t take pictures all that often, but I do go to a big airshow each year and I’ve found that I really enjoy taking pictures there. The iPhone does an OK job, but it’s obviously no match for a good setup.

I’d like to someday get a serious camera and whatever lens(es) I would need to get good close-up shots of the planes in the air. I realize you generally get what you pay for, but budget for this would be limited.

Any suggestions on equipment, new vs. used, etc.?

Thanks