'' Airline '' is the common term for commercial aviation transportation service using aircraft.
Formerly, a synonym for beeline, or the shortest path between two land points regardless of obstacle. As defined by a 1913 dictionary: "Air line, a straight line; a bee line. Hence Air-line, adj.; as, air-line road." As Of 2005 this meaning has fallen into disuse). See Air Line Railroad for Railroad s named in that manner.
