In This Story DAL -2.08% TD -0.21% At its investor day Wednesday, Delta Air Lines ( DAL -2.08% ) plotted a slow and steady course toward a cautiously optimistic 2025. But one proposal that caught analysts’ eyes was a move to break up its flight classes even further from the half-dozen options that passengers already have to choose from. Suggested Reading Air is leaking from the International Space Station — and the US and Russia disagree on why 'A public health crisis': At least 19,000 people