They fought over the name. Of course, “Concord” in English doesn't have an 'e' on it, and it does in French. The British compromised and said we'll put an 'e' on it, and we'll have the 'e' stand for excellence.” Indeed, Concorde's technological innovations still awe aviation experts today.

The "E" at the end of Concorde was a subject of high-stakes diplomatic theater between the British and French governments. Originally, the French spelled it with the "E" (Concorde), while the British intended to use the English spelling (Concord). The dispute turned into a national insult when British PM Harold Macmillan removed the "E" to spite Charles de Gaulle after a perceived snub in 1963. However, in 1967, the British Minister for Technology, Tony Benn, famously "restored" the letter during the aircraft's rollout in Toulouse. To appease the British public and maintain the "entente cordiale," Benn brilliantly re-branded the "E" as a "gold standard" symbol of unity. He declared that the "E" stood for Excellence, England, Europe, and Entente (the alliance). He privately joked it could also stand for "escalation" due to the project's massive costs, but officially, the "E" became the symbol of a unified European technological achievement, ensuring the aircraft would have a single, internationally recognized name that honored both its founding nations.