As far as I understand, this (as offered by many airline) is "just" a discounted rail ticket and the airline will not assume any responsibility on delays. The L

As far as I understand, this (as offered by many airline) is "just" a discounted rail ticket and the airline will not assume any responsibility on delays. The Lufthansa offer goes beyond that: the trains have an LH flight number, and you get a single ticket. They rebook you in case of delays and there is a dedicated luggage droppoff/collection point right at Frankfurt airport train station.