article_snippet: Thirteen minutes later, the plane slammed into the French Alps.
article_snippet: Flight 9525 took off 20 minutes late.
article_snippet: At 10:29 a.m., air traffic radar detects that the plane is starting to descend.
article_snippet: Three minutes later, air traffic controllers try to contact the plane and receive no answer -- shortly after which an alarm goes off in the cockpit, warning of the "sink rate," Bild reported.
article_snippet: It's 10:38, and the plane is at 4,000 meters (about 13,000 feet).
article_snippet: Two minutes later, investigators think investigators hear the plane's right wing scrape a mountaintop.