When Boeing designed the 720B, they essentially took the 707 and made it more efficient. The 720 was an improved variant of the 707, with the main difference being that the 720 was powered by Pratt & Whitney JT3C turbojet engines instead of the original 707’s Pratt & Whitney JT4A engines. Additionally, the 720 had a slightly shorter wingspan and a lighter fuselage.

One of the major successes of the Boeing 720B was its fuel efficiency. The Boeing 720B had an improved fuel efficiency of up to 20 percent compared to the 707, thanks to the more efficient engines and lighter weight structure. This allowed the 720 to have a longer range and a higher payload capacity than the 707.

The 720B also had an improved cabin, which was more comfortable and quieter than the 707’s. Boeing also made improvements to the landing gear and brakes, which allowed the 720 to land safely in shorter distances.

Overall, the Boeing 720B was a major success for Boeing. It was an improvement over the 707 in almost every way, and it was also more fuel efficient and had a longer range.

However, there are still some areas where Boeing can do better. For example, the 720B was not as fast as the 707. The 720B had a maximum speed of just 535 mph, compared to the 707’s maximum speed of 607 mph. This is a significant difference, and it limits the 720B’s ability to compete with other jets in terms of speed.

Another area where Boeing can do better is in the cabin design. The 720B’s cabin is much more comfortable and quieter than the 707’s, but it is still not as modern or luxurious as some other jets. Boeing could make improvements to the cabin design to make it more attractive to potential customers.

Finally, Boeing could also make improvements to the engines. The Pratt & Whitney JT3C turbojet engines that power the 720B are relatively old, and they are not as fuel-efficient as some of the newer engines that power other jets. If Boeing could come up with a more fuel-efficient engine, it could further improve the 720B’s efficiency.

Overall, the Boeing 720B is a great aircraft. It is more efficient than the 707, has a longer range, and a more comfortable cabin. However, there are still areas where Boeing can do better, such as increasing the speed, improving the cabin design, and coming up with a more fuel-efficient engine.