AP PHOTOS: An arduous search, grief and horror. Looking back at the 2015 Germanwings crash

First, the plane disappeared from radar screens somewhere over the French Alps, on March 24, 2015.

Then, families of the 150 people aboard Germanwings Flight 9525 started showing up at airports. In Barcelona, Spain, where loved ones had boarded the plane, and Duesseldorf, Germany, where loved ones were meant to land.