Andrej Kolar at Naviter Info <<info>> writes:

http://justsoar.com would work to replace the out of date files at our site for US airspace, but there is a free alternative here: http://soaring.xinqu.net/Airspace/NA/. The files are created and maintained by Lynn Alley.

You can read the OpenAir txt files into SeeYou (Tools, Airspace). To set the colors for airspace that you want, be sure to uncheck the box that says use the colors in the file.