Glad to hear your upgrade went through fqtvcph. Mrs. KroFlyer and I are travelling on SK909 later this week and are booked in Y. Bought Uto in september for 161 and 152 euro, plus service fee (we're on seperate bookings and for some reason my price was slightly cheaper for this leg). Flightstats has our flight looking pretty full at the moment:

A/0 C/2 D/2 J/2 Z/0 R/0 Y/2 S/2 B/0 E/1 M/0 H/0 Q/0 V/0 W/0 U/0 K/0 L/0 T/0 G/0 N/0

909's availability has been varied for the past couple of weeks, some days looking wide open, then availability diminishing, on a rotation. We're on SK904 coming back in January, but availability is still pretty good right now, so currently I don't have much hope for the return leg. We paid 152 each about a week ago, plus service fee, for that flight.