There was a personal jet that Lena owned in which they were traveling. Since Vegas was far away, everyone decided that it would be better to fly there.
Lena hasn't informed anyone about Bella's return since she was told to keep it a secret. However, the core members of the clan were told about her return since they would surely ask the Leader about this sudden negotiation. And also, the base where Bella and the others would be staying always remains under close watch.
So rather than hiding it and getting caught accidentally, it was better to inform them beforehand.
Sitting inside the plane, Carl could be seen staring at the distant Korean lands intently.
Richard heaved a sigh and told him, "We aren't abandoning her, Carl; we are taking another step towards her freedom."