Casper hadn't been sitting so far back in the plane, but he just so happened to be in the aisle when the young blonde started shouting for help. His head turned, reluctantly slow, away from the back of someone else's head he'd been looking at. How he had missed the blonde's predicament before, Casper couldn't fully explain, except that there was a helluva lot going on in the plane right at that moment and he was doing what he could to compartmentalize the important from the miscellaneous.
Still. He should have noticed her sooner. Casper pushed his way around someone else in the aisle, then crouched down next to her so he'd be more on her level when he spoke. "It's alright," he said, doing what he could to keep his voice soothing. He was more or less successful, though nothing could've gotten all of the stress out of him. Nothing except waking up from all of this and realizing it was all a dream, anyway. Or a nightmare. "My name's Casper. I'm going to help you get out of there, but I need you to stay calm."
He looked around while he spoke, trying to find anything sharp in their immediate vicinity. Casper hadn't taken any kind of knife on the plane with him, no scissors. Nothing. But that was secondary to keeping her calm. As tight as that belt seemed to be holding her, she couldn't afford to start freaking out.
"I'm going to reach in for the belt buckle," Casper said. He glanced up at her face quickly. "I know you've probably tried this, but..." He started to reach in toward her midsection, intending to grab the belt as much as he could to try and use sheer muscle to get the buckle unjammed.