At our location between Lorient and Pontivy. there would always be a flight with 2 booms once a week presumably training and very regularly flights of what I assume are sea surveillance aircraft slow with long external antenna from the military airbase at Lorient.
Would a war involving France stop for lunch?
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They would have to air drop baguettes with their own little parachutes
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Better still, they could drop 1 or2 day old baguettes on the enemy, as good as any missiles and cheaper 
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Apologies, Sue. I had made an entirely unwarranted assumption that @Rachel05 was complaining about sonic booms.
You are quite correct that it’s possible (and common) to see a low flying fast jet nearby before you hear the sound for reasons others have explained above.
Memo to self: make sure I reply to what the op wrote rather than what I think they wrote.
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Dwarvish battle-bread? (if you’ve never read Pratchett then just ignore).