User blog comment:Stryzzar/Amy or Samey - comparison/@comment-1427230-20140821231326/@comment-24971793-20140822143243

But the background does explain (not excuse, big difference) the reason why she takes the actions that she does. That the family favores Sammy could imply that Amy is actually the twin with the inferiority complex. Deep down she feels like she's the ugly, dumb, worthless one. She feels the need to put Sammy (and others) down for herself to feel higher. If she doesn't break her sisters spirit constantly then Sammy might find some courage to stand up to her and outperform her. Which means Amy would go back to being the inferior worthless twin.

The plane scene served to illustrate Amy's dominance (basically everything that happened in that plane and during the fall served to illustrate the contestants personality). These scene's showed us that Amy has control over Sammy's life. Figuratively by showing that Sammy does everything Amy commands her ("switch seats with me, now!"), and literally when she got to decide whether Sammy would stay alive or die.

Amy didn't enter the show for the money or the competition, she just entered the show to make sure she could remain her control over Sammy. While Sammy entered the show for the opposite reason, just to get away from Amy. They where never serious about being contestants, everything about them including all of their actions revolved around their conflict.