I booked a roundtrip flight from Frankfurt, Germany to Nashville, TN. On my return flight, I will be bringing my little sister with me. This plan was formulated after I purchased my tickets. I called the travel agency to get her on the same flight as me and they said that they have. However, her flight number is different than mine and I am wondering if it is the same flight. My flight number is KL6142 and hers is DL142. I know that the KLM flight is operated by Delta, but does this mean that it is the same flight? I just want to double check before paying for her ticket. Any comments would be helpful!