The 707/720 family of aircraft are certified with the FAA under three different Type Certificate Data Sheets (TCDS). For those not familiar with the TCDS, here's the definition: "The Type Certificate Data Sheets (TCDS) database is a repository of Make and Model information. The TCDS is a formal description of the aircraft, engine or propeller. It lists limitations and information required for type certification including airspeed limits, weight limits, thrust limitations, etc." The TCDS can be found at http://tinyurl.com/47qze (long URL: http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/Ma inFrame?OpenFrameSet ) Here's the TCDS for the 707/720 family: 707-100, -200: TCDS 4A21 707-300, -400: TCDS 4A26 (I was surprised to see that the 100/200 series and 300/400 series had different TCDS) 720: TCDS 4A28 David R http://home.comcast.net/~damiross/books.html -----Original Message----- From: The Airline List [mailto:AIRLINE@xxxxxxxxxxxxxxxxx]On Behalf Of mgreenwood@xxxxxxxxx Sent: Friday, January 28, 2005 13:41 To: AIRLINE@xxxxxxxxxxxxxxxxx Subject: Re: Its Offical "787" 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 > -- No virus found in this incoming message. Checked by AVG Anti-Virus. Version: 7.0.300 / Virus Database: 265.8.1 - Release Date: 1/27/2005 -- 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