Plane crashes

FILE - In this May 8, 2019, file photo a Boeing 737 MAX 8, being built for American Airlines, is partially obscured by the engine wash as it takes-off on a test flight in Renton, Wash. A government committee reviewing how the Federal Aviation Administration certifies new passenger planes for flight has determined that the system is safe and effective but small changes need to be made. The committee was appointed by Transportation Secretary Elaine Chao in April after two deadly crashes involving Boeing's 737 Max. (AP Photo/Elaine Thompson, File)

In this photograph taken Saturday, Jan. 11, 2020, protesters hold flowers as tear gas fired by police rises at a demonstration in front of Amir Kabir University in Tehran, Iran, to remember victims of a Ukrainian airplane shot down by an Iranian missile. On Monday, Jan. 13, 2020, online videos purported to show that Iranian security forces fired both live ammunition and tear gas to disperse demonstrators protesting against the Islamic Republic's initial denial that it shot down a Ukrainian jetliner. (AP Photo)

FILE - In this Dec. 20, 2019, file photo, Iranian President Hassan Rouhani attends a meeting with Japanese Prime Minister Shinzo Abe during a meeting at the prime minister's office in Tokyo. Iran on Saturday, Jan. 11, 2020, acknowledged that its armed forces “unintentionally” shot down the Ukrainian jetliner that crashed earlier this week, killing all 176 aboard, after the government had repeatedly denied Western accusations that it was responsible. (Charly Triballeau/Pool Photo via AP, File)

President Donald Trump speaks to the members of the media before leaving the White House, Monday, Jan. 13, 2020, in Washington, for a trip to watch the College Football Playoff national championship game between LSU and Clemson in New Orleans. (AP Photo/Manuel Balce Ceneta)

In this photograph taken Saturday, Jan. 11, 2020, Iranian police officers take position while protesters gather in front of Amir Kabir University in Tehran, Iran, to remember victims of a Ukrainian airplane shot down by an Iranian missile. Online videos purported to show Monday, Jan. 13, 2020, that Iranian security forces fired both live ammunition and tear gas to disperse demonstrators protesting against the Islamic Republic's initial denial that it shot down a Ukrainian jetliner. (AP Photo)

FILE - In this Jan. 26, 2011 file photo, Nielsen Company CEO David Calhoun, center, watches progress as he waits for the company's IPO to begin trading, on the floor of the New York Stock Exchange. Calhoun took over Monday, Jan. 13, 2020, as Boeing's third CEO in the last five years, following the firing last month of Dennis Muilenburg. (AP Photo/Richard Drew, File)

Canadian Prime Minister Justin Trudeau, left, arrives with Alberta Premier Jason Kenney during a memorial for the victims of the Ukrainian plane disaster in Iran this past week in Edmonton, Alberta, Sunday, Jan. 12, 2020. (Todd Korol/The Canadian Press via AP)

In this image from video, Secretary of Defense Mark Esper talks to the press on Iran and Iraq, Tuesday, Jan. 7, 2020, at the Pentagon in Washington. (divids via AP)

CLARIFIES WOMAN WAS TALKING TO POLICEMAN - In this Saturday, Jan. 11, 2020 photo, released by Iranian Students' News Agency, ISNA, a woman attending a candlelight vigil to remember the victims of the Ukraine plane crash, talks to a policeman, at the gate of Amri Kabir University in Tehran, Iran. Security forces deployed in large numbers across the capital, Tehran, on Sunday, expecting more protests after its Revolutionary Guard admitted to accidentally shooting down a passenger plane at a time of soaring tensions with the United States. (Mona Hoobehfekr/ISNA via AP)