air line
Noun
Meaning
A pipe or tube supplying air or compressed air.
(rail transport) A railroad following a very flat, straight route between two endpoints in order to minimize travel times, choosing the shortest, most direct route practical even if an easier, cheaper (but longer) route was available.
Source: en.wiktionary.orgSynonyms
Examples
The new and much smaller company will produce the King Air line of aircraft as well as the T-6 and AT-6 military trainer/attack aircraft, the piston-powered single-engined Bonanza and twin-engined Baron aircraft.
This curious circular remnant is the old, steam-train turntable that was once part of the Raleigh's Seaboard Air Line Railway roundhouse.
The front of the DLR is great fun, to be fair, but it doesn’t come close to the Emirates Air Line, which runs services from Greenwich to the Royal Docks, taking passengers up to 90 metres above the Thames and the O2.
The notebook also followed the smaller MacBook Air line in doing without an optical drive.