The B model was never all cargo because they didn't have a cargo door. I ought to know. I was in every darn one of them more then once. The seven oh is my bread and butter subject.....careful there, guy.
Oh yeah, the C model was the combi
Ships 351, 352, 353,354 and 355 were the C models.
Ships 356 thru 386 were all B models.
And the 707 model 220 was really a 120 with different powerplants.
The Qantas birds came in the latter 60's...as did most of BN 320 models.
Braniff took their first 220 model in 59 but dumped it on a transition flight to DAL.
Ship 7071 crashed in Washington state. Ship 7072, also a model 220, was delivered to BN in Dec of 59 from Boeing.
Call me when you want to discuss the 720, I have a little knowledge of that one too,
I did some research and I would like to let you know, that YOU
are wrong and I was right. There were 4 351B's that were constructed with SCD's. They were the only B models with this feature. For your reference, the info can be found in the book by Rene Francillion titled "Boeing 707, Pioneer Jetliners" by MBI publications. It was printed 1999. On page 65, there is a picture of N351US with it's Side Cargo Door open fully, and the words Intercontinental 320B, right behind the Door 2L.
Anyway, back to the aircraft in question. They were aircraft 351, 352, 353 and 354, all delivered in 1963. Like I said, they differed from the C model because of the lack of strengthened floor. They also lacked the heavier landing gear. This is paragraph from the book:
"Four aircraft built Northwest Orient Airlines with the 707-351B(SCD) model designation were the first 707's since 367-80 to be fitted with the side cargo doors (hence the SCD in their designation). Located forward of the wing on the portside of the fuselage for loading and unloading cargo on the main deck the upward-hinged SCD measured 91x134 inches (2.31x3.40 metres). Although the 707-351B(SCD)s were ordered convertible aircraft and could carry freight, passengers, or mixed passenger/cargo loads they lacked the reinforced flooring of the more fully modified 707-351Cs. The first 707-351B(SCD) flew on May 15th, 1963, nearly 3 months after the first 707-321C for Pan American was delivered."
That is the exact quote from the book. These aircraft were out of the fleet by 1973. They are commonly thought to be 351C's, but they are not. I suggest, that next time you feel the need to respond in the manner you did, that you know what you're talking about. I happen to be extremely well-educated on the 707/727/737 aircraft. I almost posted my 707 resume here, but decided that would be over the top. I know what i'm talking, and I would be happy to discuss the 707-020(B), aka 720(B) anytime you like. But be careful. Have a nice day