Why Legroom Changes EverythingCredit: United AirlinesLegroom in premium economy matters for reasons that extend far beyond simple comfort. The distinction here goes beyond sleep alone, and premium economy offers extra comforts that are impossible in the narrow confines of an economy class seat. Last year, theoneworld carrier unveiled its new premium-heavy 787, featuring the following cabin configuration:Cabin Capacity Business class 51 Premium economy 32 Economy class (extra legroom) 18 Economy class 143 Total 244You might also like: The Most Comfortable US Premium Economy Seats You Can Book Today A closer look at which US airline offers the most comfortable premium economy seats. You might also like: Cathay Pacific Airbus A350-1000 Economy Vs Premium Economy: Features Compared How to decide whether to splash out on Premium Economy or stick with Economy on Cathay A350 long haul routes. That room to stretch, to breathe, to relax, even just a little, is the one metric that matters most when evaluating the true worth of a premium economy experience.