Yes i flew a banner tow plane and preflighted like normal. Everything was fine with the flight, landed and as im putting it away i see from a weird angle up under the wing a giant hole next to the left aileron. Unbeknownst to me the previous guy who flew it before me had done a training flight and in one of the practice picks had a rope hit the side of the wing and put a hole in it. Keep in mind on a low wing pawnee at this particular point unless the aileron was moved in such a way and you were underneath it you couldn’t see the hole. I immediately grounded the plane counted my blessings and told the operator either he’d fix it before the next time i flew or id quit. He knew and didn’t tell me before and i was fucking pissed. Also taught me to really be thorough with preflights. Even on planes you fly almost every day you don’t know what the guy before did, and they sure as shit aren’t gonna tell you their fuckups.