Boeing Co. (NYSE: BA) may have received approval from the FAA for a fix to its 787 Dreamliner battery problem, but now the company has to figure how making the changes can be accomplished. Affected airlines are based around the world. Each carrier has to deal with its own regulators, and each has its own policies about safety and testing. Together, these make a easy effort to get the 787 back into service impossible.

The Wall Street Journal said of Dreamliner test flights:

All Nippon Airways, which now operates under its newly created holding company ANA Holdings Inc. , has 180 Dreamliner pilots who haven’t been able to fly the aircraft since battery incidents prompted the suspension of 787 services worldwide in January. Training programs like lectures and flight simulators have been only available to maintain the required skills to fly the high-tech jet.

ANA may conduct at least 180 test flights “if a test flight is required for every pilot,” a person with knowledge of the airline’s 787 operations said. Still how many tests might take place remains fluid, the person added.

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