| Flawless defence, yet speedily broken (5,7) |
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| Threshold of a boom in air travel |
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| *Snapping a whip breaks it |
Wall Street Journal |
22 Jan 2024 |
| Snapping a whip breaks it |
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| It was broken by Concorde (5,7) |
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| Invisible limit of a sense |
Universal |
11 Jul 2022 |
| Effective obstacle that's quickly broken? |
The Telegraph Cryptic |
25 Mar 2020 |
| Invisible impediment in the sky |
LA Times Daily |
02 Jul 2019 |
| Invisible impediment in the sky |
The Washington Post |
02 Jul 2019 |
| Invisible impediment in the sky |
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| What 69 Across broke in October 1947 ... and what you must break nine times to reveal this puzzle's hidden phrase |
The Washington Post Sunday |
10 Dec 2017 |
| Reliable fence needs to be approached by high-flyers looking for speed |
Irish Times Crosaire |
13 Jun 2017 |
| Reliable fence needs to be approached by high flyers looking for speed |
Irish Times Crosaire |
11 Jul 2016 |
| It's responsible for a boom in flying |
The Telegraph Cryptic |
21 Mar 2016 |
| Chuck Yeager broke it |
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| Aviation term. |
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