On dozens of occasions since 2020, a private Gulfstream jet belonging to Nike has touched down at Moffett Field, a federally owned airfield on the banks of San Francisco Bay. The Silicon Valley site’s most notable feature is a hulking building known as Hangar One, which in the 1930s housed a U.S. Navy airship and today is a conspicuous landmark along U.S. 101. It also happens to sit…