Question: Note that both the flights data.frame and the planes data.frame contain a year column. Would it make sense to join these data.frames by year? Yes;

Note that both the flights data.frame and the planes data.frame contain a year column. Would it make sense to join these data.frames by year?
Yes; year in both data.frames refers to the same thing
No; year in the flights data.frame refers to the year the flight occurred, while year in the planes data.frame refers to the year that the plane was built

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