Delta Air Lines is doubling down on premium customers after budget rival Spirit went bust

Between fast-track security, lounge access, speedy boarding, and, of course, the class of ticket you buy for the flight itself, there are already a lot of ways airlines can convince you to spend money to make your journey just that little bit more comfortable.

Now, Delta wants to go even further. At an investor day on Wednesday, the airline announced a “further segmentation” of its six cabin classes — ranging from bare-bones Basic Economy and standard Main Cabin to the slightly refined…