Upon completion, passengers can expect to travel between the airport and Gare de l'Est in just 20 minutes, covering a distance of 32 kilometres (20 mi).

[1] In July 2008, a consortium of Vinci, Caisse des dépôts et consignations, Axa and Keolis was selected to finance, build and manage the line with a scheduled 2013 opening.

[5] In November 2018, the company Hello Paris, a Keolis and RATP Group joint venture, was selected to operate the line for 15 years from January 2024 with a fleet of Alstom Coradia Liners.

[6] On 29 May 2019, transport minister Élisabeth Borne announced the CDG Express would be delayed to late 2025,[7] after the 2024 Summer Olympics, in order to focus on other infrastructure works in the northern suburbs of Paris.

[12] The new line is expected to take airline customers off RER B (with which it will share some tracks), making room for local passengers, and divert 15% of airport automobile trips to rail.