[2] On the west side of the station, a future connection is planned for an air freight centre.

[2] The airport loop involves a detour of 2.1 kilometres compared to the direct line from Frankfurt Stadion to Kelsterbach.

The S-Bahn operates at 15-minute intervals to Wiesbaden either via Mainz or via Mainz-Kastel and in the opposite direction to Hanau via Frankfurt Hauptbahnhof underground, the city tunnels of Frankfurt and Offenbach and Offenbach Ost.

According to Deutsche Bundesbahn (DB), it had long been interested in the provision of a connection from Frankfurt Airport to the rail network in 1969.

[3] With the advent of jet aircraft, the number of aircraft movements at Frankfurt Airport increased by 8 percent per year between 1965 and 1970, while the number of passengers increased on average by 19 percent per year.

In the summer 1972 timetable, 48 local services ran every working day on the line.

Due to high track utilisation between Schwanheim junction and Frankfurt Hauptbahnhof, no regular-interval could be offered initially; there were irregular gaps of up to 60 minutes.

All trains from the airport ended at the Hauptbahnhof, as the extension into the city centre had been cancelled.

[8] In a second stage, between 1976 and 1979, separate tracks were built for S-Bahn operations between Kleyerstraße junction and Schwanheim, with a new bridge over the Main.

[10] In October 1975, the fundamental agreement for the "Development of the Airport S-Bahn including a second Niederrad Bridge" (Ausbau der Flughafen-S-Bahn einschließlich einer zweiten Niederräder Brücke) was made on the basis of the Municipal Transport Financing Act (Gemeindeverkehrsfinanzierungsgesetz) of 1972.

[12][13] The new section would branch off the existing line at line-kilometre 6.645 (construction-kilometre 0.0) and cross the Main Railway over a new flying junction.

[14] The existing line is then to be completely rebuilt between line-kilometres 6.8 and 10.5, including the connecting track to the Main Railway.

[15] Deutsche Bahn announced in mid-March 2014 that it would call tenders for the construction of the 4.2 kilometre section on 15 September 2014.

[16] A regional rail project called Regionaltangente West (regional tangent west) is being developed which would connect Neu-Isenburg with Bad Homburg and the NordWestZentrum shopping centre through the western fringes of Frankfurt.