Archive: https://archive.today/g6EV2 From the post: >>China has reserved five patches of airspace off its north-east coast for a 40-day period with no explanation. Beijing normally restricts airspace when it plans to conduct military drills, but it has not announced any exercises during the reserved period, which began on March 27 and will run until May 6. People’s Liberation Army (PLA) drills also do not usually last longer than a few days. The reservation is known as “Notice to Air Missions”, or Notams, and is intended to inform aviation authorities of temporary hazards along a flight route or at a specific location.