Carry on baggage was as normal, although the overhead bins were far from jammed. It was a pretty normal flight experience in most respects. Just, the outbound wasn't particularly friendly.

On the inbound, my boarding pass showed O-class. Does SunExpress have subclasses? There is not any sign of them on the electronic ticket receipt, but it does have ticket numbers starting 546. I tried to ask the gate agent about the subclasses, but when she finally understood me she said it was a "zero" to represent no class whatsoever, no Business, no Economy. The Premium seats are just the front row, which have a bit more legroom. Those, by the way, were full in both directions.