That has to do with airline maintenance, I guess, in some ways, which they have now moved offshore.
You talked about horizontal separation. You didn't talk about vertical separation. My understanding is that with modern GPS-based height systems, it becomes extremely accurate. An aircraft at 5,000 feet off the ground is actually 5,000 feet, not 4,980 feet, as might it have been with an analog-based system.
Is that more dangerous, when it might be that two aircraft are together, particularly when the vertical separations are much, much smaller, as I understand it, than horizontal separations?