Two weeks ago I flew TAP Portugal and the it was the most comfortable flights I've ever taken! It was in Economy even! This changes everything:
Normally I find airline seats uncomfortable for a few minutes and painful after half an hour or so due to the lack of back support and the feeling that I am pushed forwards when the seat is upright. Normally I spend most of the flight with a 1-1.5" recline just to relieve the pain.
In this flight though the second control which enhances back support using a pneumatic system made it very comfortable and even handled the seat being upright with any pain.
How can one find out in advance of doing the booking which plane is equipped with this back-saving feature?