1. The U.S. transportation secretary called for an inquiry into the F.A.A.’s certification of the Boeing 737 Max 8.

Elaine Chao asked her agency’s internal watchdog to audit the approval process, which has been under scrutiny since the crash last week of an Ethiopian Airlines jet — the second deadly crash involving the aircraft in less than five months.

One concern is the role that Boeing employees played. Since 2005, the agency has allowed manufacturers to choose their own employees to act on behalf of the F.A.A. to help certify new aircraft.