Its been over 3 years since Malaysia Airlines Flight 370 disappeared.

On March 8, while flying from Malaysia to China, the plane deviated from its planned route, slipping from the range of radar somewhere over the Andaman Sea. MH370 and its 239 passengers likely crashed somewhere in the Indian Ocean, but even after a massive search effort, the black box was never found—leaving the tragedy permanently shrouded in mystery.

The frightening truth is that planes are essentially unaccounted for quite frequently. When you’re flying on a plane and the screen in front of you shows your position over an ocean or the poles, it’s likely that you, the passenger, know more about your plane’s location than Air Traffic Control does. But that is starting to change.

In January, Iridium launched the first ten of 66 satellites that will, for the first time, be able to continuously track airplanes’ position, speed, and altitude across the entire globe. Although the network won’t be operational until the end of 2018 at the earliest, two of the satellites have already been switched on, and they started to send back data a few weeks ago. Read more here