In general, drag is proportional to area, while mass is proportional to volume. Very roughly, if you scaled an airplane up by a factor of two, you'd increase the drag by a factor of four, and the mass by a factor of eight. Since the larger airplane would lower drag relative to its inertia, it would decelerate at a lower rate. Of course it isn't this simple, especially when you bring induced drag into the equation, but I think the general point holds.