Production Volume 

The production numbers aren't fully clear.  Boeing Photo Store (http://gallery.pictopia.com/boeing/gallery/2966/photo/boeing:729677/?o=17) states, "More than 6,000 Sabre Jets were built worldwide." Yet, the article refers to an "extended production run of over 7,800 aircraft between 1949 and 1956."  Granted, 7800 is more than 6000, but why such a large gap?  Also, does the "production of all variants at 9,860 units" include the variants mentioned in the next paragraph, or are those in addition to the 9,860? ("added another 1,815 airframes")?  Regardless, these numbers are of a totally different magnitude then 6,000 and no citations are given.