"This image makes the invisible visible — the first American made civil supersonic jet breaking the sound barrier." ...

But while the successful test flight of XB-1 shows that supersonic flight without sonic booms is technically feasible, the ...

The Colorado-based company says specialized photography from NASA shows the shock waves as Boom’s supersonic demonstrator achieved supersonic. They also confirmed no sonic boom reached the ...

When the experimental XB-1 aircraft broke the sound barrier three times during its first supersonic flight on 28 January, it did not produce a sonic boom audible from the ground, according to US ...