This story has been corrected; See below.

In case “coach” didn’t sound low-brow enough, airlines have come up with a new, unofficial seating category: “last class.”

There, passengers’ seats are unassigned and crowded closely together. The tickets are cheap, but they can’t be exchanged or refunded. And most extras, like baggage, come with a fee, according to USA Today.

Airlines including Delta dal and American Airlines aal have announced they would be selling the bare-bones tickets in order to compete with the growing popularity of budget airlines like Spirit save and Frontier. These airlines offer low-cost tickets to customers in exchange for minimal customer service and unreliability. In October, Spirit flights had the lowest on-time arrival rate among the major American carriers, falling below 80%. Spirit and Frontier had the highest rate of complaints in the industry.

At the end of of October, American announced it would begin to sell “no frills” tickets next year. Delta’s “basic” tickets went on sale for the first time last year.

The original version of this story erroneously included JetBlue among airlines selling bares-bones tickets.