Airports need to keep an eye on how they can improve their power systems. At least two of the airport's listed in this article do have redundant systems, but still have real single point of failure issues. In one case the airport claims to have confidence in their power systems, but the two redundant power feeds run in the same duct work and share multiple cable vaults for over a mile from the airport. This means a fire or an explosive attack in any of these shared cable vaults would probably drop both power feeds. Every airport needs to review their single point of failure issues, and take appropriate actions. While they are looking at single points of failure issues, they need to look at their communications single points of failure problems.