She hadn’t received her new ID after her name change, which meant her boarding documents didn’t match her ID. But according to the content creator, airlines want newly married individuals’ valid ID to match their travel documents and boarding passes. So it’s best practice to simply make sure travel documents match up to whatever ID a person plans to bring to the airport. Most travelers only need to provide one form of identification that matches their travel documents. If they can provide documents that match their new last name, they can technically travel without using their pre-married name.