The transport ministry cleared Boeing's 787 Dreamliners to resume flight Friday night, although Japanese airlines won't put them back into service until June at the earliest.
The move follows the U.S. Federal Aviation Administration's decision to allow 787s to fly again effective Friday after approving Boeing's modified battery system last week, even though the root cause of the problem has not been found. The battery glitch caused the 787 fleet to be grounded worldwide for more than three months,
All Nippon Airways and Japan Airlines — which have more 787s than any other airlines in the world — have begun installing the modified lithium-ion battery on their planes. They are planning to conduct test flights using revamped 787s for at least a month before resuming commercial operations.