Ok - so here is the report:-
Makes for fascinating and sobering reading. Basically the cases involved people whose journeys commenced in three different continents. They looked at the dna of the virus in each of their samples and it looks like all were related - ie, they only could have logically gotten it on the plane.
You can see the seating plan in the study and they were seated throughout the plane, well away from each other. Plane was less than half full. Most seem to have been wearing masks (I presume all were).
Cliffs - even if sitting well away from someone on a relatively empty plane with everyone wearing masks you may get covid.
Now it does seem the authors were surprised at quite how many got it, so this may be an outlier, but pretty sobering stuff.
Oh, and, very surprisingly, multiple passengers on the flight were not traceable. Reassuring given that those traced passed the virus on to multiple others.