If you want to go to Orly airport to Paris, you can do it in the traditional transports, RER, taxi, bus, etc. However, the system has nothing to do with the T7 line. Take this train that takes you to Villejuif Louis Aragón station, where line 7 begins and you will be connected to the Paris metro network by two ordinary metro tickets. The journey on the T7 line will take at least half an hour, but is cheapest.
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