China's NOTAMs Indicate Rising Military Control Over Offshore Airspace

• •China's NOTAM reserved 28,000 square miles of airspace for 40 days, impacting military operations.
• •The restrictions are aimed at foreign military aircraft, particularly surveillance planes near China's coast.
• •This measure increases operational uncertainty for businesses and travelers in Northeast Asia.

On March 27, 2026, China issued a NOTAM reserving 28,000 square miles of airspace off its coast for 40 days, primarily affecting foreign military aircraft. This unprecedented duration of restrictions raised questions about Beijing's intentions, as it did not coincide with any major military exercises. The NOTAMs are seen as part of China's anti-access/area denial strategy, targeting areas frequented by foreign military surveillance planes. While commercial aviation routes remain largely unaffected, the measure increases operational uncertainty for businesses and travelers in Northeast Asia. The restrictions allow the People's Liberation Army (PLA) to conduct military operations without disrupting civilian air traffic, potentially including electronic warfare and cyber operations. This situation sets a precedent for China's prolonged control over international airspace, complicating cross-border operations and logistics for sensitive sectors.