[4] Vehicles with diesel traction may enter the regional station only when the level of their exhaust emissions are below set limits.

A three-track underground station was already envisaged when a new and larger passenger terminal was planned at Frankfurt Airport in the mid-1960s.

The costs for the station and the 7.5 km (4.7 mi) long airport loop line amounted to 100 million Deutsche Mark (approximately €51 million), with Deutsche Bundesbahn funding half and the other half split between FAG and the federal government.

In the late 1980s, it was planned, as part of the construction of the airport's eastern terminal (Terminal 2) and the Cologne–Frankfurt high-speed line, to build a fourth (long-distance) platform track and to upgrade the rail infrastructure, including building a tunnel to connect with the Mannheim–Frankfurt railway towards Zeppelinheim.

Despite the high cost that would have been required for the reconstruction of the existing building, it was expected that capacity would not have been sufficient in the medium term.

Although a feasibility study found that would have had positive returns, this option was rejected due to its high cost.

[8] Since the beginning of 2010, the distribution level and the connecting corridor to Terminal 1 have had a new, brighter design following a fundamental modernisation.