The linked story was U.S., Canada Missed Chances For Radar C2 Upgrades. An excerpt:
The U.S. and Canada missed an opportunity to deploy an upgraded NORAD radar-based air defense system before the 2001 terrorist attacks because of problems that have hindered both countries' efforts to field a tried-and-proven system for more than a decade, including escalating costs, blown deadlines, mismatched technology and mismanaged programs, according to government audits and acquisition documents.
Two years before the 9/11 attacks, the U.S. and Canadian NORAD partnership was supposed to start installing a new command-and-control (C2) system for the radars with capabilities that possibly could have been used to help stop terrorists from slamming their hijacked jetliners into the World Trade Center and Pentagon. The technology for that system would serve as the building blocks for the system the two countries eventually deployed last year - the Battle Control System-Fixed (BCS-F).