Grounded Boeing 737 MAX aircraft are seen parked in an aerial photo at Boeing Field in Seattle, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson TPX IMAGES OF THE DAY

A grounded Icelandair Boeing 737 MAX aircraft is seen parked in a Boeing employee parking lot in an aerial photo at Boeing Field in Seattle, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson TPX IMAGES OF THE DAY

Dozens of grounded Boeing 737 MAX aircraft are seen parked in an aerial photo at Boeing Field in Seattle, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson

An aerial photo shows Boeing 737 MAX airplanes parked on the tarmac at the Boeing Factory in Renton, Washington, U.S. March 21, 2019. REUTERS/Lindsey Wasson

Grounded flydubai and Royal Air Maroc Boeing 737 MAX aircraft are seen parked in an aerial photo at Boeing Field in Seattle, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson

An unpainted Boeing 737 MAX aircraft is seen parked in an aerial photo at Renton Municipal Airport near the Boeing Renton facility in Renton, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson TPX IMAGES OF THE DAY

Grounded Boeing 737 MAX aircraft are seen parked in an aerial photo at Boeing Field in Seattle, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson

Grounded TUI Airways and Icelandair Boeing 737 MAX aircraft are seen parked in a Boeing employee parking lot in an aerial photo at Boeing Field in Seattle, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson

A grounded Boeing 737 MAX aircraft is seen parked in an aerial photo at Renton Municipal Airport near the Boeing Renton facility in Renton, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson

An aerial photo shows Boeing airplanes, many of which are grounded 737 MAX aircraft, at Boeing Field in Seattle, Washington, U.S. March 21, 2019. REUTERS/Lindsey Wasson

An Air Europa-branded Boeing 737 MAX aircraft is seen grounded at a storage area in an aerial photo at Boeing Field in Seattle, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson

A grounded Boeing 737 MAX aircraft is seen parked in an aerial photo at Renton Municipal Airport near the Boeing Renton facility in Renton, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson

An aerial photo shows several Boeing 737 MAX airplanes grounded at Boeing Field in Seattle, Washington, U.S. March 21, 2019. REUTERS/Lindsey Wasson

A grounded China Southern Airlines Boeing 737 MAX aircraft is seen parked in an aerial photo at Boeing Field in Seattle, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson

Grounded Boeing 737 MAX aircraft are seen parked in an aerial photo at Boeing Field in Seattle, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson

Grounded Boeing 737 MAX aircraft are seen parked in a storage lot and Boeing employee parking lot in an aerial photo at Boeing Field in Seattle, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson

An aerial photo shows Jet Airways and 9 Air Boeing 737 MAX airplanes, as well as a 737 MAX 7, grounded at Boeing Field in Seattle, Washington, U.S. March 21, 2019. REUTERS/Lindsey Wasson

An aerial photo shows Boeing 737 MAX airplanes parked on the tarmac at the Boeing Factory in Renton, Washington, U.S. March 21, 2019. REUTERS/Lindsey Wasson

Unpainted Boeing 737 MAX aircraft are seen parked in an aerial photo at Renton Municipal Airport near the Boeing Renton facility in Renton, Washington, U.S. July 1, 2019. Picture taken July 1, 2019. REUTERS/Lindsey Wasson

An aerial photo shows rowers on Lake Washington near a line of Boeing 737 MAX aircraft at the Boeing factory in Renton, Washington, U.S. March 21, 2019. Picture taken March 21, 2019. REUTERS/Lindsey Wasson