Referance Organization-Most Helpful? Opinions please!!

I figured this would go here.
I'm working on my 1/144 scale census webpage and need to break down my American jet aircraft section (It's getting too big.) Currantly to get to the page in question You would go from the 1/144 main area to "Aircraft" to "United States" (the propeller driven craft are here till they need split up) to "American Jet Aircraft". Here's the question: How can jet aircraft be split into two categories and allow for the easiest result? What would be the most logical branching? I had thought about Civil and Military but several planes were both and in 1/144 converting one to the other isn't too difficult. and figured leaving them mixed would be best. I was hoping for something that would work for planes of other nations as well. The link is in my sig if anyone wants to see it to comment. I'm starting to get desperate because I can't come up with anything and I can't add more American Jets til then!
Thanks guys!!