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Boeing only assembles planes, they dont manufacture the components.

A lot of components are actually imports from other countries, eg Japan manufactures wings.

So? If you import $100 billion dollars of components and you do nothing to them before reselling abroad, you have $100 billion of exports.

WRONG - You have nothing, the import and exports cancel each other.

You are arguing about net cost/profit.

We don't export nor import "net" anything. The definition of exports is not affected by imports.