The B720 was a short to medium range derivative of the Boeing 707 and shorter in size.
First flown in November 1959 and entering operational service with United Airlines in July 1960, it was built in two variants, the B720 and B720B, powered respectiveley with the P & W JT3C and P & W JT3D turbofan engines.
Production stopped after 154 units produced, but it was kept being used due to it being very similar to the B707.
It was finally retired in 2010.
Another classic jet aircraft, there are several liveries to choose from:
Middle East Airlines.
Pakistan International Airlines.
Braniff International Airways.
And many more.
P.S: This isn’t a duplicate topic.