I, in fact, clearly wrote "current cash flow" in response to your post and you did not dispute it. Because you're full of BS.
And some assets produce 0 cash flow.
The fact that assets "can" create cash flow is not in dispute. Of course they can. Your claim that all assets function is "cash flow" is still incorrect and dumb. And your claim that my gold bars "produce income" while in the safe deposit box, based on the value of gold, is also dumb.
You can copy all the cute terms you want out of your airport book, but it does not change the fact that "cash flow" and "assets" are not the same thing. Not all assets "function" is cash flow. Your bank does not list your house as their "asset" on their balance sheet. And the Fed does not own a printing press.