The intensity of light and cloud id very dramatic and stunning in many of these shot, something which is often missed in colour. Some really good stuff here.
When I age one of my shots, I'll sometimes use custom layers that I've made myself. Otherwise, I just fool around with things like contrast, curves and gaussian blur.
I got a great deal on Filter Forge and have been playing around with some of the vintage filters, tweaking settings and getting the feel for it. That was my first airplane one. This is my second.