https://support.communitybrands.com/hc/en-us/community/posts/30727419185677-8888-29-1467-United-Airlines-Premium-Economy-What-You-Need-to-Know

What is premium economy on United and what does it offer? While your exact United Premium Plus economy experience may vary depending on your route (the class of service is currently available on select long-haul international, premium transcontinental and Hawaii routes), there are still a few things you can count on no matter what.