The Russians had a plane in WWII which was somewhat like the A-10. It was the Stormovik. It was heavily aromored and deadly on tanks.
When Erich Hartmann the all time ace of aces first tried to shoot one down his bullets just bounced off. The other pilots took the young man aside and told him how to shoot one down.
I think it involved getting below the Stormovic and shooting from under and behind it.
Very good idea.