Originally Posted by SealBeach
...the current 737 Y seats, the current Recaro Y seats, current C seats, First Suite seats, etc. -- I'm assuming all the foregoing examples with the exception of First Suite seats were installed on the aircraft when UA acquired them, correct?
Not at all. For example, on the 737 fleet, the previous F cabin seats were grey leather, much more square and felt wider. Same seats in domestic F on the 757s and 727s (God rest their souls). Even the first Airbus aircraft delivered had different F seats than they do now.
The 777s originally came fitted with different C and F seats as well. They underwent cabin upgrades with just a couple years under their belt. For examples, see:
737:
http://www.airliners.net/open.file/087959/M/
777:
http://www.airliners.net/open.file/061858/M/