Question: When was the sound barrier broken for the first time?
Answer: 1947
Disambiguated annotations:
qaPairs: question: When may the sound barrier have broken for the first time by dinosaurs?
answer: 150 million years ago
question: When was the sound barrier thought to be broken for the first time, but likely due to inaccurate ASI Readings?
answer: 1942
question: When was the sound barrier broken for the first time by an unmanned missile?
answer: 3 October 1942
question: When was the sound barrier broken for the first time, in a manned level flight?
answer: October 14, 1947