I think they do (or at least did).
I’m a platinum for life member of KLM. At some point, I got asked to join a focus group and being interested in aviation, as well as a regular traveller, I said yes.
The forum was run by a third party. Essentially, we were handed topics, questions or topics to discuss every few months. We were also free to start conversations ourselves. Periodically, a KLM employee would join in and provide direct feedback.
Loved being part of it. Sometimes, we got to hear things ahead of time. I remember being asked what they should call their extra legroom economy seats at the front of long haul; I suggested economy comfort and they took it and ran with it. I remember being quite chuffed at that when they rolled it out.
We talked about routes, service levels, comfort level, flight experience, airport experience, food, perks, what is important to different demographics etc….
Was quite an insightful time!