The Simple Explanation for All These Flying Objects

The North American skies, it turns out, contain lots of unidentified objects. That is the unremarkable conclusion from a remarkable weekend in which fighter jets downed a trio of separate flying things—over Alaska, northern Canada, and Lake Huron. This weekend’s sky wars followed the identification and eventual downing of a Chinese surveillance balloon earlier this month, only after it had traversed the continental United States and was safely over U.S. waters.

This is a strange series of events. A single deployment of Air Force units to obliterate something in the sky is unusual; to...