The establishment of a new station between the A 3 and B 43 was examined for its economic justification for long-distance traffic as well as for the regional traffic towards Mannheim. Two options were examined for connections from the airport station to the new line. In addition to the realised route along the A3 via Mönchhof, a route running north towards the Mainz–Kelsterbach–Frankfurt line through the southern outskirts of Kelsterbach was examined. A connection with the Mainz-Frankfurt line was provided in both cases. Deutsche Bundesbahn classified the (unrealised) Klaraberg route as favourable for operations. The Mönchhof option had lower costs and lower environmental impact on Kelsterbach. The establishment of connecting curves between the new line and the line to Mainz would reduce the operational drawbacks of the Mönchhof option.