Duke From Canada, joined Sep 1999, 1155 posts, RR: 2 Posted (10 years 8 months 8 hours ago) and read 3771 times:
Of the 1010 Boeing 707s that were built between 1957 and 1991, 154 were actually designated "Boeing 720" - a medium range, shorter version of the plane. Nowadays, however, we often treat it as merely a subtype from what I see. I think we can agree (note my thread of 2 days ago) that the 707's "prototype" (the "Dash-80" or the 367-80, not included in the 1010 planes) and the similar looking KC-135 tanker were truly different models and not 707s, but the 720's differences don't really seem enough to fully qualify it as a different model. Originally it was supposed to be the 707-000 anyway. For some reason, they changed the designation.
So my question is twofold. First, why did they call it the 720 and secondly, are the differences really so different that it deserves to be given a separate type number? For example, is it more different from the original 707-100 than the 707-300 is?
Jetjack74 From United States of America, joined Jul 2003, 7413 posts, RR: 50
Reply 1, posted (10 years 8 months 8 hours ago) and read 3728 times:
The designation for the 720/B was a combination of 2 designations. The 720 was originally designated as a 707-020/B and was shortened to 720 to simplify it and make it seem like a new version rather than have potential customers thinking that they're buying the base model.
Justplanesmart From United States of America, joined Mar 2001, 722 posts, RR: 2
Reply 3, posted (10 years 8 months 7 hours ago) and read 3711 times:
I will do my best to answer both parts of your query. The designation 720 came as a direct result of United being the launch customer. In a nutshell, W. A. "Pat" Patterson, longtime head of UA, wanted it to be called something other than a 707, because United had already bought the DC-8. Boeing suggested 717, but apparently Pat did not like a number ending in 7, so it became the 720 (his opinion clearly changed by the time the 727, 737, and 747 were all purchased by his company). As to whether it qualifies as a separate type, I have always considered it a 707, and Boeing has always included its sales/production in the totals for the 707. If you really want to study the minutiae between the 707/720 variants, click below and read away. http://dac.senternet.com/forum/showthread.php?s=ddabca5d0187ff6fae9d911cdb751231&threadid=21531&highlight=boeing+707
Cedarjet From United Kingdom, joined May 1999, 8124 posts, RR: 54
Reply 4, posted (10 years 8 months 7 hours ago) and read 3693 times:
Dead right about United not wanting to buy "707s" (even little ones) after the big DC8 purchase, but I think 717 was impossible not because of Patterson's dislike of the number 7 (727, 737 etc), but because the Boeing designation for the KC-135 was 717 (which also tells you why 717 was never used til the rebadged DC9 of the late 90s).
fly Saha Air 707s daily from Tehran's downtown Mehrabad to Mashhad, Kish Island and Ahwaz
Isitsafenow From United States of America, joined Feb 2004, 4984 posts, RR: 23
Reply 6, posted (10 years 8 months 4 hours ago) and read 3515 times:
This grayhair has alway wondered about the 720 and why it was numbered so. Thanks to all for the info. I have ridden numberous 720B models with CO, AA, called the 707 AstroJet as noted in an earlier post, and NW. Thank you all again.
If two people agree on EVERYTHING, then one isn't necessary.
CanadianNorth From Canada, joined Aug 2002, 3390 posts, RR: 9
Reply 7, posted (10 years 8 months 4 hours ago) and read 3476 times:
The 720 is basicly a 707, only it is a bit shorter and has a slightly lighter structure. The 707 was mainly for longer hauls so Boeing made the 720 a little smaller and lighter which meant it was more efficient on shorter hops and was able to operate in and out of airports with shorter runway lenghs.
The diff between a 720 and a 720B is the same as say a 707-300 and a 707-300B.
The reason it was called the 720 and not the 707-020 or the 717, was already stated in previous replys. In my oppinion it should be slightly diff from the 707, but not a completly diff type (717 or something), and they seemed to have the same idea when they called the "707-020" the "Boeing 720"