Which doesn't apply to the U.S. industries of air travel, long-distance telephone communication?

These industries were considered to be local natural monopolies in the distant past.

Local governments tended to regulate these industries in the 1970s and 1980s
Recently, these industries have been deregulated or are moving toward deregulation.

Prices of the commodities in question tended to fall after deregulation.

Deregulation resulted in a few firms with enough market power that the quantity purchased fell substantially after deregulation.