You would think that air should be free, but of course air, or at least the right to send signals through it, has not been free for some time. The FCC controls the right to use air to transmit information, divvying the air up into all sorts of frequencies and selling them off to the highest bidder. From a bankruptcy perspective, the right to use the air is well understood as an asset, and can be transferred or even sold under the right conditions.
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