Looks like it must have been the Iceland Air B757 as you suggest Canon.
Friend picked it up on SBS at 2040 at 13750 ft descending,I couldn`t see anything else large that was descending around that time.
Aircraft was TF-FIG which I am pretty sure has been into BFS before operating Lourdes Charters.
I thought the tail was a red flash on blue but it`s actually a yellow flash on blue-light in our yard isn`t great
