K.M. Richards
Program Director, The Eighties Channel™
Where we get into a sticky wicket is the music in those airchecks. Some of the radio history websites have been taken to court by music rights companies, claiming digital royalties. They sites claim it's historic material and should be exempt, but there are no exemptions in the copyright act.
The question was whether or not airchecks could be sold or traded. The history websites weren't part of that question (although, as Mike posted, that has been an issue).