If you have grabbed 2 planes that day, or 3 planes in the previous week, you can't get more used planes.
So if you get 2 planes on Nov 1, you can't get another until Nov 2. If you get that 3rd plane on Nov 4, you can't get any more until Nov 9. If you do grab 2 more planes on Nov 9, you'll then be locked out until Nov 12.