Boeing 757-300 United Wheels and FlapsBoeing 757 300 United Airlines airplane model. The 757 was in service for 13 years without a stretched variant. But in September of 1996, Boeing announced the 757 300 which was 23. 4 ft (7. 13m) longer than the 757 200, increased the maximum number of passengers from 231 to 289, and cargo capacity by almost 50%. Mahogany wood. Scale 1 100. Wingspan 15 inches, Length 21. 5 inches