I haven’t gotten a thank you note since back during the heat of Covid when planes were empty. I’ve had some verbal thankyou’s on trips where IROPs happened, but that’s about it.
Pre-Covid I flew KE several times intra-Asia, and always got an overly verbal thank you from the FA’s, even when seated in Y and just a lowly GM at the time. Once it happened as we were literally taking the runway for takeoff. I was half asleep after having just arrived from MSP, and was quite alarmed to the have the FA gently wake me as we were starting the takeoff roll headed to BKK… Have a few fights on KE next year and curious if it happens again.