US officials have attributed the November 13 FAA nationwide ground stop to overload in legacy air traffic control switches, routers, and telecommunications infrastructure during equipment patching and modernization, with no evidence of cyberattack, malicious intrusion, or foreign involvement. Homeland Security Secretary Markwayne Mullin and Transportation Secretary Sean Duffy stated there were zero signs of nefarious activity, no system footprints, and no claims of responsibility, while ruling out connections to other recent outages. This technical diagnosis, backed by initial investigations from DHS, FAA, and NSA, underpins traders' near-certain view that attribution to Iran will not occur. Late developments such as new forensic findings from the ongoing probe or an official reversal could still alter the outcome before market resolution.