The 757 & 767 were developed concurrently although the 767 did have it's first flight approximately 5 months before the 757. As for the 720, the 707 was designated the 720 when it was modified for short-to-medium routes and for use on shorter runways. I guess they didn't consider it a separate model, just like the 777-200 and 777-300 aren't different models. Mark Quoting David MR <damiross3@xxxxxxxxxxx>: > >Since the naming of the initial 707, all Boeing commercial jets have > >>been named in succession based on the 7-7 formula: 717, 727, 737, 747, > >757, 767 and 777 up to the latest Boeing commercial jet transport, the 787. > > Not quite true. There was the 720. And the succession shown above is not > correct. The 717 came last. The first 717 was actually a military version > of the 707. Also, if I'm not mistaken, the 767 saw service before the 757. > > David R > http://home.comcast.net/~damiross/books.html > -- > No virus found in this outgoing message. > Checked by AVG Anti-Virus. > Version: 7.0.300 / Virus Database: 265.8.1 - Release Date: 1/27/2005 >