Pretty much. If the airspace is large enough it will not have a significant effect on the behavior of the woofer. If also the rear wave is completely separated from the front wave, then you have an infinite baffle. If the airspace is small enough to effect the behavior of the woofer, then you have a "large" sealed box. Smaller still and you get a traditional sealed box where the airspace augments the soft parts of the woofer and the behavior is (hopefully) what you want. If the rear wave can interact with the front wave, then you have a leaky enclosure and some cancellation will occur. If the rear wave augments the front wave in a way that benefits you, then you might have a tuned leaky box and if you do it just right by using the appropriate math, you get a ported enclosure, or maybe some variation of a horn or transmission line or one of many other kinds of enclosures.

And some combination of anything between is possible, which is what a somewhat large leaky Car door with non-rigid walls is. It is not ideal or optimized for anything in particular, but it can work well enough that most people still enjoy it.