first-class adventure, plus-size travelers are often treated like second-class citizens. “Airlines and resorts roll out the red carpet for people with traditional bodies,” full-figured fashion influencer Stephanie Nadia, 33, told The Post. “But whenever I’m traveling, and I have to ask for a seat belt extender or for an extra-large hotel bathrobe, I feel like I’m getting the ‘unwelcome mat,'” the Brooklyn native added.Recently, globe-trotters of size on Twitter, TikTok and Instagram have made