Of the 15 transport lines planned during the application, not all will be there. Only the extensions of line 14, to Saint-Denis - Pleyel to the north and to Orly to the south, the RER E partially to Nanterre and some other lines.
The rest after this ad will be announced in the coming years. The Paris 2024 application file was submitted in 2017. It promised up to three metro, train and RER lines to reach Paris from the airport of Roissy.