Late last week, a curious alert appeared in the Federal Aviation Administration’s database of Notices to Airman, or NOTAMs, which, among other things, alerts aviators to chunks of airspace that are temporarily off-limits. The details strongly point to the comings or goings of a high-flying aircraft between either Area 51, also known as Groom Lake, or the Tonopah Test Range Airport, two of the U.S. military’s most closely-guarded flight test facilities, and the Pacific Ocean to the southwest of San Francisco, California. The NOTAM, which was first pointed out by users of the Dreamlandresort.com message board, was issued on March...