Potty training question

M 🌻💕

Hello, let me preface this by saying when my older 2 were toddlers, we hardly went any where so this wasn’t ever an issue lol. Okay so we’re taking a plane to visit a relative and I now have a fresh 2yo. She’s in the middle of potty training. We’re not checking any baggage and I’m not bringing her potty. But she does really well using the potty. Should I even bother bringing any undies with us or just diapers? Could this trip set her back?