The choice between the Boeing 777 and the 787 Dreamliner is a classic debate in 2026, often pitting "raw space" against "modern technology." The Boeing 777 is physically wider, which can lead to a more "airy" cabin feel; however, many airlines have moved to a 10-abreast (3-4-3) configuration in Economy, which can feel quite cramped compared to the original 9-abreast design. The 787 Dreamliner, while slightly narrower, is engineered for physiological comfort. It features a lower cabin altitude (6,000 ft vs. 8,000 ft), higher humidity, and larger windows that dim electronically. These features are specifically designed to reduce jet lag and fatigue on long-haul flights. Generally, if an airline uses a 9-abreast layout on a 777, it is the clear winner for seat width. But for most 2026 travelers, the 787 provides a more consistent, tech-forward experience that leaves you feeling significantly more refreshed after a 12-hour journey across the ocean.