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

Since then, there have been questions about the country's underfunded air traffic control systems, deficient radar system and the airlines' ability to cope with a surge in travelers.

NPR: Nearly 200 Feared Dead in Brazil Air Crash

It is set to replace radar in commercial aviation as the next generation of air traffic control systems come online by 2020.

BBC: The key to preventing lost planes