Prepositions I am (in, on, at) the plane.

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"I'm on the plane" is correct; "I'm in the plane" is, technically speaking, correct grammar (because you're inside an enclosed space) but not a collocation. We don't say it that way, even though we could. Prepositions can be tricky and are often reliant on how we perceive a situation. "On" is normally used to indicate something is on a specific surface or on top: "the salt is on the table", "the cat is on the TV" (aren't they always?). When traveling, though, we often say "I'm on the plane" or "I'm on the ferry", because it's an abbreviation of the phrase "I'm getting on the ferry" (we just drop the verb "getting"). When we use "at", we use it to indicate a specific place as compared to a physical space, for instance a place on a map. "I'm at work" or "I'm at the supermarket" is where we would find ourselves if we were looking at a map. Or we could say "I'm in my office" (a physical space) or "I'm in the meat department", instead of "at work" or "at the supermarket".

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