I think I have that intuition because the great majority of seatbelt unbucklings in my experience happen while traveling at a speed of zero (because they’re in cars, not planes). The sentence has no cues to indicate the unusual context of being in a plane (and in fact, figuring that out is the point of the example). So my mental process reading that sentence is “that’s obviously false” → “hmm, wonder if I’m missing something” → “oh, maybe in a plane?” and the first step there seems a lot more reliable (in other reasoners as well, not just me) than the second or third.
I think I have that intuition because the great majority of seatbelt unbucklings in my experience happen while traveling at a speed of zero (because they’re in cars, not planes). The sentence has no cues to indicate the unusual context of being in a plane (and in fact, figuring that out is the point of the example). So my mental process reading that sentence is “that’s obviously false” → “hmm, wonder if I’m missing something” → “oh, maybe in a plane?” and the first step there seems a lot more reliable (in other reasoners as well, not just me) than the second or third.