I have read the first 2 books. I generally agree with the previous comments about them, i.e. the first book is more informative and the second book is just pictures.
However, from my point of view, the first book is actually not as great as it seems. True- it looks pretty and artsy at first, but when looking closer, one would notice:
1. The design/production is careless- there are some graphics which has a resolution way too low for printing (looks like they are directly downloaded from airline websites-you can see the pixels); there is a page showing airline logos which looks like they are drawn by little kids- colours way off and strange shapes... I nearly coudln't recognize the Cathay logo; there are also some pictures in the book that seems to be taken using a cheap camera using built in flash, looks really odd to find that in a supposedly 'designer' book.
2. The information is sometimes very wrong- for example, the author said that footrests first appeared on commercial aircraft in the 80's when Pan Am introduced them. But one can easily find photos of passengers enjoying footrests in the 50's on DeHaviland comets, or on constellations.
3. The content is not insightful and is poorly researched- the contents seems just a relaying of information issued by Airline's press releases. It failed to give the reader good understanding of the real story evolution of aircraft cabins over the years, and the key event's involved. For example, regarding business class lie-flat seats, it talked about something like '''BA
introduced the club world flat bed.... and then SQ
went even further to introduce the spacebed which is even wider and longer''' .... - this is very bad information, because the spacebed an angled lie-flat seat, which is very different from BA
's truly horizontal bed. The 'angled-lie-flat' is an important revolution in business class seat design, which is started by Virgin Atlantic (with their J2000 seat). The book failed to mention any of these, treating fully flat bads and angled lie flats as the same thing.
4. Most of the pictures seems to come from Airline press releases- they seem to be all publicity pictures provided by airlines (which were originally used for commercials) which has been shown elsewhere already. Also, there is a limited source of pictures- the pictures seems to be provided by a few airlines, in other words, the whole book is generally centered around a few airlines that had helped the author (including Singapore Airlines, British Airways, United... etc...).
The second book, on the other hand, has a lot of photos that are not easily found from other sources, which can be quite interesting.
So depending on what you are looking for. If you are not familiar with aircraft cabins, then perhaps the Jetline Cabins would give you more information. But if you are already familiar with aircraft cabins, then perhaps the Aircraft Interior can give you something that is more unique....