It has been more than two days since Alaska Airlines Flight 1282 made an emergency landing after a section of the aircraft ripped off midair, leaving a hole in the plane at 16,000 feet. Here’s what we know so far about an investigation that officials from the National Transportation Safety Board opened into the incident.

At this point, the probe is focused on the Alaska incident and not on a broader set of aircraft, such as separate versions of the 737 MAX or other planes. The focus could change as evidence surfaces about what happened.