BDS writes:

Do you have any idea where the name "spam can" comes from? Hint: it has
nothing to do with size.

No doubt from SPAM, a registered trademark of Hormel. This in turn is rumored
to be a contraction of "spiced ham."

If you were using the term correctly you would realize that your imaginary
747 is also technically a spam can.

I was using the term tin can, meaning a light, flimsy, primitive aircraft.

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