Five separate recognized class records for altitude with payload in piston-engine aircraft are set by five different AAF crews flying Boeing B-29A Superfortresses at Harmon Field, Guam. Col. J.B. Warren also sets a separate record for greatest load carried to 2,000 meters.
The rate of building B-21 bombers would speed up if the fiscal 2026 defense budget passes. But it remains unclear how much capacity would be added, and whether the Air Force would simply build the bombers faster, or buy more.