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Regional flights such as SIN-NRT - no, fixed back economy seats in 2-4-2 configuration.
The legroom is 31" before the 3" slide, so its quite squeezy after u slide. see this image for comparison.
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They have a 3-3-3 configuration with reclinable seats but so far its for transpacific and european flights only. Source: I took all 3 cabin configurations recently.