US Narrows Hormuz Air Defense Windows Amid Escalating Iran Shipping Attacks

The Financial Times reported on September 12, 2026, that the US military has reduced its air defense coverage for commercial tankers transiting the Strait of Hormuz to two specific daily time slots, down from broader overnight windows, effective early September. This adjustment follows intensified Iranian attacks on vessels, particularly at night, along the southern route near Oman's coast that the US has protected since May amid the ongoing US-Iran conflict that erupted on February 28, 2026.

Multiple outlets, including The Times of Israel, Arab News, and Business Times, corroborated the FT account, citing NCAGS emails advising shipowners to apply for protection and adhere to recommended transit times (e.g., departures around 9 a.m.) for optimal support. One email explicitly noted that nighttime transits have proven less secure. The change optimizes limited US air assets, with operating costs estimated at $25,000–$75,000 per hour per advanced aircraft, as noted by CNA researcher Joshua Tallis.

The moves occur against a backdrop of mutual escalations: Iran has targeted dozens of vessels, prompting US strikes on Iranian tankers and a naval blockade of Iranian ports. Oil exports from Gulf states (excluding Iran) have fallen to roughly two-thirds of prewar levels, with rerouting via pipelines. Diplomatic efforts include Iran-Oman talks on safe passage routes, with Gulf foreign ministers set to meet in Oman on September 16, 2026, as reported by Reuters and others.

Broader context reveals sustained US efforts since May to maintain limited oil flows under air cover, including deployments of F-16s, carriers, and unmanned systems, while facing Iranian missile and drone threats that have forced tactical adaptations. This reflects strained resources in a protracted conflict impacting global energy security and trade routes.