Economy vs. premium economy: What's the difference?
Comprehensive Review of the United Premium Plus Seat – Gourmet Flyer
Airline Seat Terminology: What Is Premium Economy, Basic Economy, and Beyond
Premium Economy Vs Economy: Differences Explained
United revamps Basic Economy in Transatlantic market
Basic Economy United Airlines
Review: American Airlines Premium Economy - Travel Codex
United Airlines Seat Selection: Information for Travelers - CheapAir
Economy plus subscription details
American Airlines: Economy vs. Basic Economy [Comparison]
Is United Airlines premium economy worth it on long flights? : r/ unitedairlines
Edward Russell on X: .@united's basic economy vs economy fare: / X