How does Pasoon's plane connect to Reshmina's flashback to her siters wedding?

The theme of revenge arises when Pasoon and Reshmina get into a heated discussion about the righteousness of Pasoon joining the Taliban and giving up the information about Taz staying in their home. Pasoon reminds his sister that the Americans killed their older sister on her wedding day, and he questions how Reshmina could possibly want to give refuge to an American after that.

During this discussion, Reshima is holding Pasoon's cherished toy airplane, as she tells him that he cannot join the Taliban. Passon responds by reminding her that the Americans killed the person who gave him the plane: an American drone dropped a bomb on her on her wedding day.