So far, 50 Dreamliners have been delivered to airlines by Boeing, but all are currently grounded due to concerns that one of the lithium-ion batteries on board could leak, potentially causing fires.

BBC: A Boeing 787 at Farnborough air show

Investigators in Washington have taken X-rays and CT scans of the lithium-ion battery that caught fire in Boston, the safety board said.

CNN: Quick fix for Dreamliner looks less likely, experts say

Additional details released by the safety board said all eight cells of the lithium-ion battery involved in the Boston 787 fire showed varying degrees of thermal damage.

CNN: What's wrong with the Dreamliner?