text:  The similarity is that in both cases, those systems were considered, as I said, ancillary, secondary. The batteries on that aircraft were backup batteries. And essentially, Boeing Engineering said, not so important. We probably may not need them. And if we do need them, it's just a backup. We'll outsource some of the design. We won't look at the design as carefully as we ordinarily would because it's just a secondary system. And that's sort of what happened to the MCAS as well.