Not TTC question but plus size and flying question..

Have any of you flown United? And what were your experiences? My husband has a training in New Orleans and I am going with him. For some reason I am terrified of the seat belt on the plane not fitting around me. My size is about 20/22. I wear a 2x-3x shirt size. I don’t know why I’m freaking out about it 🤦🏻‍♀️