skyway

[skahy-wey]

noun

air lane.
an elevated highway, especially one well above ground level and composed of a series of spans.

Origin of skyway

First recorded in 1915–20; sky + way¹

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

The city of Chicago has done a similar deal, leasing out its Skyway toll bridge for $1.83 billion.
Sale of the Century to Balance the Books
Niall Ferguson
February 21, 2011

It was dark outside his windows, but a glow above the walls across the skyway told of the city pulsing and murmuring beyond.
Security
Poul William Anderson