BRU-LHR on a A321 on a November 11th.
About 10 passengers in total I reckon. I assume they brought in a bigger aircraft to fly everyone to Brussels for the WW1 ceremonies in Ypres and had to fly the plane back to LHR.
Although it's not unusual to see the A321 on that route but a bit weird it was an early afternoon flight on Wednesday on A321.
The picture was taken right after "Boarding Complete" but doesn't really do justice to the feeling of sitting in an almost empty airplane.
Second one was probably a jumpseat flight on a TNT B737. Just the captain, first officer, myself and a couple tons of cargo