Previous posts have coveredalot of reasons, but for me the biggest reason is the Delts Hubs.

I end up flying between a lot of midsize and smaller metro areas, which means connecting. And while that also means I am flying regionals (more than I would care to), it also means choosing between connections in DTW, MSP, SEA or ORD, EWR, PHL, SFO.

And in the battle between who has the best connection hubs, DL wins and it is not even close.