Why is it common to speak of "Concorde" rather than "the Concorde"?
Ultimately it was the chosen name for the project and since it was a bi-lingual project the name was used in by both french and english sides working on it (7:40 into the video), as such the Definitive Article is commonly dropped when talking about it. It also derives from the word agreement and prior to the actually aircraft being built everyone was simply working on an undersigned agreement to build a plane. 


  The name Concorde was chosen as, in both French and English (as
  "Concord"), the word means agreement. The plane was to be called
  Concorde in both France and Britain. However British Prime Minister
  Harold Macmillan, decided to remove the "e" from the end, as he was
  annoyed that his French counterpart, Charles de Gaulle, cancelled a
  meeting with him due to having a cold. The British government's
  Minister for Technology, Tony Benn, later replaced it, claiming that
  the "e" stood for Excellence, England, Europe and the Entente Cordial.