Wife and I both AA plat traveling rsw to lga with change in MIA, rsw to Mia cancelled after we had boarding cards, weather related. AA books us on Delta non stop to Jfk, but when we get to security we are pulled aside and now we are SSSS, almost missed that flight. Never happened before, was it because of change or random. We were not SSSS on the AA boarding cards. We are also Dl medalion no status.