Known as Delta Premium Select, the airline introduced premium economy in 2017 with its Airbus A350. Today, the product flies on most of its widebody fleet, with all A330s and all but nine A350s equipped. The 767-400s have premium, and all but eight 767-300s do too.

Key Takeaways Like rival Delta Air Lines, United Airlines posted a sizable increase in quarterly premium revenue, notching 10% year-over-year gains.On its earnings call Wednesday morning, United executives made frequent note of their basic economy offerings after the carrier reported 20% revenue improvement for its cheapest tickets.

Shares of United Airlines Holdings Inc. rallied in after-hours trading Tuesday, after the airline reported fourth-quarter results that beat expectations and offered an upbeat first-quarter profit outlook,