The difference is that in one scenario (universal ban) you're taking them away entirely, depriving law-abiding people of the opportunity to enjoy them in situations where they are appropriate to possess and use, such as hunting, self-defense, collecting, and in the other scenario (onboard an airplane), you're limiting people's access to them in an environment where they have absolutely no safe and practical utility whatsoever.
Never have I, nor will I, propose and support a measure to ban all assault rifles. I'm proposing a limit to 15 round magazines, which would not affect hunting, self-defense, or collecting.
Marine- Please read some of my arguments before posting a meme and immediately discounting them.
Von Messa-The government would pick up the tab, after making much needed spending cuts in a number of other areas (Let's try not to open that can of worms too far so that the thread may live). Either that, or there could be a 1 year period during which businesses could still sell off their current inventories. After that the refund system would go into effect, but this time the tab would be much smaller.