Why Do Rear Windows On Airbus A340s Slope Upwards?

The Airbus A340 has several features that render it an instantly recognizable aircraft. For example, it is a rarity in being a four-engine widebody airliner with only one passenger deck. This places it in contrast to the double-decker Boeing 747 and Airbus A380 ‘superjumbo.’ Furthermore, the A340-600 variant is strikingly long and thin in its design, to an almost disproportionate extent. However, there is another feature that sets it apart, namely its upwards-sloping rear windows. However, what is the reason for this design quirk?

Article link: https://simpleflying.com/rear-a340-windows-slope-upwards/

Video source links:
A340-600 Airbus https://www.youtube.com/watch?v=nVGLpCsyBI4
A340-600 Lufthansa https://www.youtube.com/watch?v=FVx_MqGC04A
A340 A380 Hi Fly Supplies https://www.youtube.com/watch?v=3W9Rs7OGN-o
A340-300 Air China https://www.youtube.com/watch?v=046_CHm7G2w
A340-300 Edelweiss https://www.youtube.com/watch?v=QQhIBJEtIoM
A340-300 Philippine Airlines https://www.youtube.com/watch?v=lNvkY8u1Mo0
A340 Lufthansa Star Alliance https://www.youtube.com/watch?v=7ZebvuMPV0w
A330 Finnair Kansai https://www.youtube.com/watch?v=cRQTjHbIELM
A340 Virgin Atlantic https://www.youtube.com/watch?v=ACr99W81RH8
A340 Virgin Atlantic https://www.youtube.com/watch?v=Y682BgEnTvw

Photo links:
https://commons.wikimedia.org/wiki/File:Airbus_A340_(China_AL)_(4501422955).jpg
https://commons.wikimedia.org/wiki/File:Airbus_A300_cross_section.jpg

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