The massive disruption in air travel in the US, as a result of which more than 15,000 flights were delayed or canceled, was caused by a shaky infrastructure, writes the "Financial Times". According to the publication, the flight control system suffers from decades of underfunding, and controllers at many junctions still use technology from the 1970s. The FAA's capital budget is actually shrinking because of inflation, despite the $12.5 billion Congress appropriated.