High-rolling investors have positioned themselves bearish on Delta Air Lines (NYSE:DAL), and it’s important for retail traders to take note.\This activity came to our attention today through Benzinga’s tracking of publicly available options data. The identities of these investors are uncertain, but such a significant move in DAL often signals that someone has privileged information. Today, Benzinga’s options scanner spotted 9 options trades for Delta Air Lines. This is not a typical pattern. The sentiment among these major traders is split, with 33% bullish and 66% bearish. Among all the optio…