The U.S. Air Force Is Gradually Rebuilding Its B-52 Bombers From

In seven years or so, if everything goes according to plan, the U.S. Air Force should get what looks like a new bomber.

The B-52 has been in service for almost 80-years and is one of the oldest aircraft out there. Is there no replacement in queue for it. Or are long range bombers things

Why may the US never retire its B-52 strategic bombers despite almost 70 years in service? - Quora

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米空軍、B-52戦略爆撃機の大規模な近代化改修に取り組む

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Why does the US still use the B-52 when trillions of dollars per year are spent on new hardware/crafts? - Quora

米空軍、B-52戦略爆撃機の大規模な近代化改修に取り組む

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How are the B-52's still in service (and be in service for decades in the future) due to their age? Wouldn't the air frames (due to stress of flights/landings) be worn out