as, air-line road.

See also: Air

References in classic literature ?
When unusual needs arose for them, such as the building of the great highways and air-lines, of canals, tunnels, subways, and fortifications, levies were made on the labor-ghettos, and tens of thousands of serfs, willy-nilly, were transported to the scene of operations.
Durapipe UK has provided its specialist compressed air distribution pipework system, Air-Line Xtra for an expansion project at Glendon Products.
Air-Line Xtra was specified to convey compressed air from the ring main system to the pneumatic machinery within the new factory.
Durapipe Air-Line Xtra provided a suitable product for this job as the smooth internal bore of the product prevents scale build up to ensure the air is kept clean and uncontaminated for the lifetime of the product.
Brian Leach, director of Glendon Products comments: "We specified Air-Line Xtra due to the ease of installation it provides and because we didn't need to employ a specialist contractor, it not only offered a cost effective option but also flexibility for future expansions.
Most importantly, Air-Line Xtra ensures that the compressed air is kept clean and uncontaminated which is paramount for Glendon Products.
4 says: "On board submarines, the officer in charge of the control room (officer of the deck) and the officer in charge of the maneuvering station (engineering officer of the watch), diving officer of the watch, and chief of the watch shall have air-line masks with annunciators available for use.