This is about a 2016 survey conducted by Chapman University:
In Chapman University's latest Survey on American Fears, pollsters asked about 10 alleged cover-ups. In the most striking result, 25 percent of the respondents agreed—and another 7.5 percent strongly agreed—that the "government is concealing what they [sic] know about the North Dakota Crash."
What's striking about that? Just that the pollsters had never actually heard any conspiracy theories about a "North Dakota Crash"; they threw that in to see how people would respond to a vaguely ominous-sounding episode that they invented.
That's right, there is no "North Dakota Crash" nor government report about it. But the knee-jerk response of 1/3 of Americans is that the government isn't being forthcoming. What does that say about us??