Back in the mid 70's, I let my AMA membership go because of a major relocation, new home and new job. Gone were my flying buddies, hobby shop and place to fly. A few years later, I thought of restoring my membership but my number had been reissued. I didn't want a different number, so I let it go for some time. As luck would have it, the guy who had been issued my number had not renewed so the next time I checked, my number was available again. I jumped on that and re-upped and have stayed with it to this day keeping my number safe and sound.