DHS Secretary Mullin: No indication threat caused FAA ground stop

The significance here is attribution, not aviation: a senior security official is publicly ruling out a threat as the cause of an FAA halt, which matters because unexplained ground stops quickly invite speculation about infrastructure or cyber incidents. Beyond that, the item is thin — no scope, duration or operational detail — so the practical read for markets is limited. What's worth watching is whether the cause is formally explained and whether the disruption proves isolated or part of a pattern.