Nippon Cargo Airlines was forced to ground its fleet on 17 June after Japanese authorities discovered a number of serious deficiencies in record keeping. They subsequently found maintenance records showed incorrect parts and lubricants may have been used in servicing.
The airline has been forced to re-examine its practices, replace or repair incorrect items, and each aircraft is being re-examined to make sure it meets standards.
The airline hopes to be fully operational by the end of July.
The cause was largely attributed to the company cutting costs and corners following a financial review. The loss of so many cargo aircraft from a tight market has been sharply felt in Asia and in the North America routes over the Pacific.