JGPH1A From , joined Dec 1969, posts, RR: Reply 1, posted (8 years 8 months 2 weeks 3 days 3 hours ago) and read 4184 times:
I think earlier versions had 3 windows (because the upper deck was supposed to be a lounge) but this changed to I think 10 window with later series 100 models (I don't know when). I don't think there is a 'standard' number of windows even on later versions, because some carriers have the aft windows blocked because they have a galley in the rear of the upper deck, other carriers have the forward windows blocked because they have a crew rest up there.
777ER From New Zealand, joined Dec 2003, 11643 posts, RR: 17 Reply 2, posted (8 years 8 months 2 weeks 3 days 2 hours ago) and read 4146 times:
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Boeing started offering B741 customers 16 windows on top deck shortly after the launch and heaps of the B741 customers prefered 16 upper deck windows, some airlines still ordered the 6 window upper deck thou (TWA).
Amy From United Kingdom, joined Feb 2005, 1150 posts, RR: 8 Reply 7, posted (8 years 8 months 2 weeks 3 days ago) and read 4023 times:
The 747 is a eunique aircraft because of it's upper deck. It's not the only aircraft with an upper deck but I believe the only aircraft with an upper deck that can be altered. When Boeing came out with the upper deck for the 747-300, JAL (amongst others) still had some classic 747s on order. JAL asked Boeing to convert these last 2 747-100s to the SUD (stretched upper deck). KLM and AF also have SUD varients of classic 747s. Boeing also offered a conversion package to extend the upper deck of classic 747s already flying. I believe it is so that any 747 can have it's upper deck stretched or reduced as per the airline's requirements. Hence, any improvements made for the 747-200 could have translated on to 100s that were still being made at the time. Also, new -200s could have been specified with the original lounge upper deck for comonality with -100s already in service.
This is one of the reasons for my love of the 747, it can be customised to suit the airline it works for. There are 747Ds and 747SRs, 747-400Fs with winglets and a short classic upper deck. 747-206B/SUDs with KLM with the body of a -300 and the rest of the plane as a -200. The 747 is the ultimate in modified flying! I doubt there are any two 747s the same between airlines.
I expect even the VC25 could have an SUD if ever needed. The VC-25 in itself is a customisation of the 747 frame with the original classic body and the newer -400 engines.
PanAm747 From United States of America, joined Feb 2004, 4242 posts, RR: 9 Reply 9, posted (8 years 8 months 2 weeks 2 days 21 hours ago) and read 3910 times:
From what I understand, "plugging" or "unplugging" these windows is not a problem at all.
TWA ordered -100 models for itself, but acquired -200 models over the years, and had Boeing (or their own maintenance) plug the windows for fleet commonality.
The lack of knowledge of this topic by the conspiracy theorists was sadly brought to life after the TWA 800 crash. The plane, a 747-131, which had been leased to Eastern Airlines early in its career, had 3 windows visible on each side. However, upon impact with the ocean, the plugs popped out, revealing an entire row of upper deck windows. Many claimed that this was not the original airplane (amongst other claims), to which Boeing had to explain over and over again that, indeed, this was the same airplane.