The construction of Terminal 1, the ‘United’ Terminal, was started in 1987. Designed by Helmut Jahn, this glass and aluminum complex includes two buildings – Concourse A and B – connected by an underground walkway featuring a 744-foot flashing neon sculpture, galactic synthesizer music and moving sidewalks. The 85-acre facility — which would include 42 gates upon its completion in December 1988 — also includes a $38 million, computerized baggage-handling system that can process 480 bags a minute.

http://www.chicagotribune.com/news/ct-ohare-international-airport-development-history-timeline-htmlstory.html

You can see 3 images of the flashing neon walkway on a previous post