Most folks fly into Dallas and drive to Waco 1 1/2 hours. There is an airport in Austin... also 1 1/2 hours to Waco. Crawford is about 20 minutes West of Waco. There is a map on the thread before the rally. You might want to look over there.
But, if one really hates to drive, you can fly to Waco. Doesn't save much time though, what with waiting in DFW for your puddle jumper connection. Never mind about running from terminal to terminal (actually they have monorail) at DFW. Driving from DFW would definitely be easier, although getting to the rental cars at DFW is at least as difficult as getting to the commuter terminal.