Law enforcement officers investigate the scene of a helicopter crash that killed retired basketball star Kobe Bryant in Calabasas, California, U.S., January 26, 2020. REUTERS/Ringo Chiu 

Los Angeles county firefighters arrive on the scene of a helicopter crash that reportedly killed retired basketball star Kobe Bryant in Calabasas, California, U.S., January 26, 2020. REUTERS/Kyle Grillot 

A military helicopter flies near flooded areas after the Xepian-Xe Nam Noy hydropower dam collapsed in Attapeu province, Laos July 26, 2018. REUTERS/Soe Zeya Tun 

A helicopter carrying rescued schoolboys flies past a Thailand national flag in Chiang Rai, Thailand, July 9, 2018. REUTERS/Tyrone Siu 

A helicopter carrying rescued schoolboys flies to a military airport in Chiang Rai, Thailand, July 9, 2018. REUTERS/Tyrone Siu 

A police helicopter flies over the Tham Luang cave, where 12 boys and their soccer coach are trapped, in the northern province of Chiang Rai, Thailand, July 6, 2018. REUTERS/Athit Perawongmetha 

The remains of an F-16 Israeli war plane can be seen near the Israeli village of Harduf February 10, 2018. REUTERS/ Ronen Zvulun 

Smoke is seen where a small airplane crashed near a supermarket in a residential area outside Lisbon, Portugal April 17, 2017. REUTERS/Rafael Marchante 

Wreckage of a helicopter is seen after it crashed in Istanbul, Turkey, March 10, 2017. REUTERS/Osman Orsal 

Wreckage of a helicopter is seen after it crashed in Istanbul, Turkey, March 10, 2017. REUTERS/Osman Orsal TPX IMAGES OF THE DAY 

French rescue services work at the scene of an accident involving fifty vehicles which crashed due to fog on the road between La Roche-sur-Yon and Sables-d'Olonne, France, that killed five and injured more than forty, December 20, 2016. REUTERS/Stephane Mahe 

A rescue worker sits near the wreckage of a plane that crashed into the Colombian jungle with Brazilian soccer team Chapecoense onboard near Medellin, Colombia, November 29, 2016 REUTERS/Jaime Saldarriaga 

ATTENTION EDITORS - VISUAL COVERAGE OF SCENES OF INJURY OR DEATHRescue crew work at the wreckage of a plane that crashed into the Colombian jungle with Brazilian soccer team Chapecoense onboard near Medellin, Colombia, November 29, 2016. REUTERS/Jaime Saldarriaga TPX IMAGES OF THE DAY 

An Air Force F-16 with the Thunderbirds air demonstration squadron sits crashed in a field 4 miles south of Colorado Springs after performing a fly-by of the U.S. Air Force Academy graduation ceremony where President Barack Obama gave the commencement address, in Colorado Springs, Colorado, U.S. June 2, 2016. REUTERS/John Wark 

Civilians carry a piece of a Syrian warplane that was shot down in the Talat al-Iss area, south of Aleppo, Syria April 5, 2016. REUTERS/Ammar Abdullah 

Boys pose with pieces of a Syrian warplane that was shot down in the Talat al-Iss area, south of Aleppo, Syria April 5, 2016. REUTERS/Ammar Abdullah 

A man inspects the wreckage of a Syrian warplane that was shot down in the Talat al-Iss area, south of Aleppo, Syria April 5, 2016. REUTERS/Ammar Abdullah 

Rebel fighters and civilians gather around the wreckage of a Syrian warplane that was shot down in the Talat al-Iss area, south of Aleppo, Syria April 5, 2016. REUTERS/Ammar Abdullah 

Civilians inspect the wreckage of a Syrian warplane that was shot down in the Talat al-Iss area, south of Aleppo, Syria April 5, 2016. REUTERS/Ammar Abdullah

Rebel fighters and civilians gather around the wreckage of a Syrian warplane that was shot down in the Talat al-Iss area, south of Aleppo, Syria April 5, 2016. REUTERS/Ammar Abdullah 

Rebel fighters and civilians gather around the wreckage of a Syrian warplane that was shot down in the Talat al-Iss area, south of Aleppo, Syria April 5, 2016. REUTERS/Ammar Abdullah TPX IMAGES OF THE DAY

A diver (C) gestures to a boat that arrived to salvage a airplane that made an emergency landing in the waters of the Mediterranean sea off the shore of Tel Aviv, Israel, April 3, 2016. REUTERS/Baz Ratner 

A fisherman watches as a police boat patrols near a airplane that made an emergency landing in the waters of the Mediterranean sea off the shore of Tel Aviv, Israel, April 3, 2016. REUTERS/Baz Ratner 

Policemen on a boat work near an airplane that made an emergency landing in the waters of the Mediterranean sea off the shore of Tel Aviv, Israel, April 3, 2016. REUTERS/Baz Ratner 

A man takes a photo with his cell phone of an airplane that made an emergency landing in the waters of the Mediterranean sea off the shore of Tel Aviv, Israel, April 3, 2016. REUTERS/Baz Ratner 

A policeman puts a cable around the tail of an airplane that made an emergency landing in the waters of the Mediterranean sea off the shore of Tel Aviv, Israel, April 3, 2016. REUTERS/Baz Ratner 

A police boat patrols near a airplane that made an emergency landing in the waters of the Mediterranean sea off the shore of Tel Aviv, Israel, April 3, 2016. REUTERS/Baz Ratner 

Relatives and family walk at the crash zone in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Relatives and family look at the crash zone in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Relatives and family walk at the crash zone in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

White roses lie on the ground of the crash site in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier TPX IMAGES OF THE DAY

Relatives and family look at the crash zone in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Relatives and family look at the crash zone in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Relatives and family look at the crash zone in Le Vernet during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes, France, March 24, 2016.REUTERS/Jean-Paul Pelissier 

White roses lie on the ground of the crash site in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

White roses lie on the ground of the crash site in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

White roses lie on the ground of the crash site in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

White roses lie on the ground of the crash site in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

French gendarmes secure the area of the crash zone in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

French gendarmes secure the area of the crash zone in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Relatives and family look at the crash zone in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier 

Relatives and family look at the crash zone in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Relatives and family walk at the crash zone in Le Vernet,France, March 24, 2016during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes.REUTERS/Jean-Paul Pelissier 

Relatives and family walk at the crash zone in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes.REUTERS/Jean-Paul Pelissier 

Relatives and family walk at the crash zone in Le Vernet,France, March 24, 2016during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes.REUTERS/Jean-Paul Pelissier 

Relatives and family walk at the crash zone in Le Vernet,France, March 24, 2016during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes.REUTERS/Jean-Paul Pelissier 

Relatives and family look at the crash zone in Le Vernet, France, March 24, 2016 during the first anniversary ceremony to commemorate the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier 

Members of victim's families attend a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016 to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Members of victim's families attend a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016 to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Lufthansa Chief Executive Carsten Spohr (R) and Germanwings Managing Director Thomas Winkelmann (L) arrive at a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016, to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

General view of the memorial site for the first anniversary of the Germanwings crash in Le Vernet, France, March 24, 2016 during a ceremony to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Lufthansa Chief Executive Carsten Spohr (2ndL) and Germanwings Managing Director Thomas Winkelmann (2ndR) arrive at a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016, to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Members of victim's families arrive to attend a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016 to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Members of victim's families arrive to attend a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016 to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Members of victim's families arrive to attend a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016 to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Members of victim's families arrive to attend a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016 to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Members of victim's families arrive during a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016 to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Members of victim's families arrive to attend a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016 to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Members of victim's families arrive to attend a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016 to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier

Lufthansa Chief Executive Carsten Spohr (R) and Germanwings Managing Director Thomas Winkelmann (L) arrive at a ceremony for the first anniversary of the Germanwings crash at the memorial site in Le Vernet, France, March 24, 2016, to pay tribute to the 150 victims of the Germanwings Airbus A320 that crashed in a remote area of the French Alps near Seyne-les-Alpes. REUTERS/Jean-Paul Pelissier