It belonged to the only person she loved-the toy plane belonged to tom, whom was killed later on while doing her a favor and allowing her to see her mom before she went into the mri. tom and her shared a mutual teenage love relationship, in a recording (to which tom referred to as their personal time capsule) he includes it in the box they later dig up. while listening to the recording in toms car, they kiss, kate apologizes because tom is now married and has two-kids. as mentioned earlier, tom is later killed, and she is responsible for his death.