Originally Posted by jerry_greece

I don't remember mentioning it here (or having seen it happening before), but on one of my recent flights (I was already upgraded in C with the coupons) but after boarding was almost done, someone from ground staff @ ATH came onboard and asked a pax from Y to come to C - later i asked him and confirmed that he was on waitlist indeed (which cleared after boarding started?). Plane was not full in Y.