Perhaps “no immediate threat to flight safety” just means that no aircraft with the defect have been delivered or are in service? The phrase "Boeing said 787 p

Perhaps “no immediate threat to flight safety” just means that no aircraft with the defect have been delivered or are in service? The phrase "Boeing said 787 planes already in service do not need to be grounded" kind-of implies that there are aircraft with this defect in service, but it need not necessarily do so.