How can you catch a dragon that is flying along at top speed, say, running away? Forget whether chasing it is a good idea. Once it is, say, a mile or two away, wouldn't it be pretty much out of range of ground based attacks, and now it would need to be chased?
There are lots of ways I can think of to engage the thing once it lands or when it is close, but the speeds I saw in the PRD look very fast. Little critters start at 100 and the terrifying max size ones were 250 fly. I didn't see anything that could catch the big ones. Air elementals can fly at 100.
Teleportation, I guess, or some very long range (sight?) level spell?
I'm especially looking for a flying creature or mount or maybe even a magical device (like wings of flying) that could do it, rather than a spell.
The old guys are really, really fast.