I saw this on a trip back from the US the week after 9/11. The plane was almost empty (I estimated about 20 passengers) and everybody was spread out across the seats.

Also in March this year on an Austrian Airlines flight to Chicago I saw the same. I had a feeling that on the VIE-ORD route it is a common thing. The cabin crew didn't seem to mind one bit, but they did make a point of telling people not to move from their allocated seats until after take-off. Was there are reason for that?

btw, good to see a responsible parent putting the safety belt on your daughter englisha.