This quote is from Encarta.com:
> air check
> air check (plural air checks)
> recording of advertisement: a recording of an advertisement, kept for
> reference purposes.
This leads one to believe it was a term that came out of commercial
agencies to check on the airing and have proof of their commercials, but
this is supposition on my part. It must have later been expanded to its
more general use of recording broadcasts in general from off the air.
Tom Fine wrote:
> What is the genesis of the term "aircheck" and how did it come to mean
> "off-air recording", or did it mean something different at another time?
> -- Tom Fine