But by that argument neither is floating around in the ISS - you're still being accelerated by gravity, you're just in the fortunate position that you have enou

But by that argument neither is floating around in the ISS - you're still being accelerated by gravity, you're just in the fortunate position that you have enough velocity not to hit the earth. If the colloquial term "zero gravity" applies to someone in the ISS, then it also applies to someone in a suddenly dropping aircraft.