Replacing outmoded radar-based air traffic control with more efficient systems has been possible for decades, but it has not happened.

FORBES: It's Time To Upgrade The Entire World's Infrastructure

Ann Marie Brennan, a manager at the air-traffic control office, was quoted in the report, released on August 2, as saying the radar display showed the two planes "pass right over each other".

MSN: Air traffic controllers blamed for 2011 close call