 CBS News special report. I'm Elaine Cobb. Earlier, we spoke with CBS travel editor Peter Greenberg, who joined us from Amsterdam to talk about how unprecedented this outage is. We've seen software meltdowns before at United Airlines. We've seen it at Southwest. We even saw it at Continental Airlines before they became United Airlines. But these are individual airlines. A system-wide situation like this, I haven't seen it since 9-11.