What makes the plane so expensive? The 0️⃣  777-300ER can carry 365 passengers compared with the 787-9's capacity of 280. The GE engines on the 777 model develop 0️⃣  62% more thrust than the 787's two engines. The plane is also longer than the Dreamliner, has a greater wingspan 0️⃣  and a greater wing area, and is taller.