Down near the bottom of the article: "The next aircraft, tail number 4191--which is the last jet built under a 60-aircraft, multi-year purchase--is set to be formally handed over to the USAF on 15 March."
60 aircraft...what a crying shame.
That's 1 for each of 0bama's United States with 3 left over!
If I am correct,the FAA assigns the tail number and there are different categories. I may be wrong.