Boeing Company President and Chief Executive Officer Dennis Muilenburg, right, and Boeing Commercial Airplanes Vice President and Chief Engineer John Hamilton faced intense questioning about what the company knew and when. Andrew Harnik/AP hide caption
Family members hold photos of victims killed on Ethiopian Airlines Flight 302 and Lion Air Flight 610 on Tuesday. Susan Walsh/AP hide caption
Boeing President and CEO Dennis Muilenburg appeared before the Senate Transportation Committee on future of the grounded 737 Max on Tuesday. Andrew Harnik/AP hide caption
Michael Stumo and his wife Nadia Milleron, whose daughter was killed in the Ethiopian Airlines Flight crash, attend a House committee hearing June 19. They and other victims' families have been a driving force in the campaign to keep the Boeing 737 Max grounded. Mark Wilson/Getty Images hide caption
Grounded Gol Airlines, Southwest Airlines and Alaska Airlines Boeing 737 Max aircraft at Boeing facilities in Moses Lake, Wash., last month Lindsey Wasson/Reuters hide caption
A Southwest Airlines Boeing 737 Max lands in Victorville, Calif., in March. Matt Hartman/AP hide caption
The World Trade Organization says the United States can impose tariffs on up to $7.5 billion worth of goods from the European Union as retaliation for illegal subsidies to Airbus — a record award from the trade body. Francois Mori/AP hide caption
Boeing 737 Max airplanes are stored in an area adjacent to Boeing Field last month in Seattle. Airlines around the world are cutting flights because of the grounding of the plane. Stephen Brashear/Getty Images hide caption
Southwest Airlines Boeing 737 Max aircraft sit on the tarmac at Phoenix Sky Harbor International Airport on March 13. The 737 Max has been grounded worldwide following a pair of deadly crashes. Ralph Freso/Getty Images hide caption
Southwest Airlines is among the companies that grounded Boeing 737 MAX aircraft because of a software failure that caused fatal crashes of Lion Air and Ethiopian Airlines planes. The FAA said Wednesday it has found a new flaw in the plane that needs to be fixed. Ralph Freso/Getty Images hide caption
Boeing Chief Executive Dennis Muilenburg speaks during a press conference after the annual shareholders meeting in Chicago on April 29. Jim Young - Pool/Getty Images hide caption
Raytheon and United Technologies are combining in what they describe as a merger of equals. Jim Watson/AFP/Getty Images hide caption
Boeing said on Sunday that it was aware of problems with a key safety indicator in 2017, but it didn't inform airlines or the FAA until after the Lion Air crash a year later. Here, 737 Max jets built for American Airlines (left) and Air Canada are parked at the airport adjacent to a Boeing production facility in Renton, Wash., in April. Elaine Thompson/AP hide caption
Boeing Chief Executive Officer Dennis Muilenburg speaks at the Boeing Annual Shareholders Meeting on Friday in Chicago. Pool/Getty Images hide caption
A Boeing employee works on the fuselage of a 737 Max 9 test plane at the company's factory in Renton, Wash., on March 14. Orders for durable goods jumped 2.7% last month, fueled in part by strong demand for commercial aircraft. Stephen Brashear/Getty Images hide caption