Selling Baggage Space When Flying What Happens To Unused Baggage Space In Commercial Airlines?

What happens to unused baggage space in commercial airlines? - selling baggage space when flying

So I recently traveled to Hawaii and all my things to pack a suitcase in my hand because I did not want to pay 15 or so many dollars for a bag. Who got me thinking, if any additions to heavy packages and a "personal matter to bear," what everyone who's on luggage space for your luggage, only a few months? Selling space for shippers? And if people take too much for Firefox and airline cargo hold full of packaging and the plane was overloaded filled? Check with the advent of pay for the luggage, it could again become a danger to the security?