The US Air Force will have 2 types of bombers. 1 of them will service 100 years

In the mid-1930s. The 21st century American air force plans to have only 2 types of bombers in service. This will, of course, be a brand fresh B-21 Raider, and what is interesting is that they stay in the B-52 service for the longest time. They will undergo deep modernisation and motorization, which will keep them in service by at least 2050. This means that they have a chance to exceed 100 years of service in American strategical aviation.