the first ng to be built was a 737-700. it was finished on december 8, 1995. this aircraft was 2,843rd 737 built. it first flew on february 9, 1997. the prototype 737-800 was finished on june 30, 1997 and first flew on july 31, 1997. the smallest of the 737ngs, the -600, is the same size as the -500. it was the last ng to be launched (it was launched in december 1997). it first flew on january 22, 1998. the faa certified it on august 18, 1998. a