The other day we bought tickets on Delta from "da Burgh" -JFK-Paris-Vienna. We have a 1 hour 35 minute layover at CDG to make the connection with Air France to Vienna. After extensive travel in Europe this is the first time to make a connection onto our primary destination. My question is: where do we clear passport/customs? In Paris upon arrival or in Vienna? Or both?

Buon viaggio and thanks in advance.

Why do people always talk about customs when going to Europe. You don't have customs in Paris to go through no matter what (I did see it at Heathrow once for arriving US passengers, but never anywhere else). You go through customs if you choose to do so and have something to declare. I've flown to Paris and connected there many times, you don't have to go through customs.

You have to go through immigration in Paris as it is your first arrival point in Europe, then you'll go to another part of the airport for within-Europe flights, and may have to go through security again there. I know I did once (need to go through security again at either 2E or 2D) but I can't recall where I was going but it was some country within Europe, just not sure if the EU.

You will arrive on Delta in Terminal 2E, through security to Terminal 2F (Schengen terminal). 2E has three satellites, linked by automatic driverless train, so depending on which gate you arrive at, there may be a fair amount of walking. 95 min connecting time should normally be sufficient, but if you don't make it, and Vienna flight is on the same reservation, AF will re-book you on a later flight. It's possible for you to make the connection but not your luggage, in which case you report it on arrival in Vienna, and hopefully it will be found and delivered to your accommodation.

You will also go through passport control at CDG, as the entry point for Schengen area.

After quite a bit of experience with CDG I would not be at all happy with that connection. You will go through Immigration at CDG and depending on how many international flights land at once it may be brief or it may take a while (I've waited more than 30 minutes a couple of times).

It sounds like this is a single ticket so you are protected if you don;t make the ongoing flight - but I would have info on any other options so if necessary you can be very firm with staff about rebooking you (subsequent flights may already be fully booked).

Thanks to everyone for your responses.

At CdG it will take 15 or 20 minutes minimum for the plane to wheel up to the gate and passengers to inch their way into the terminal. You might try appealing to airline staff once you are inside to expedite your transfer, but the odds are still long. And if you have checked baggage, your bags may not make it even if you do. NYT's advice is valuable: Print out the schedule for later flights, or store it in a smartphone, to help negotiate a seat on a later flight when you miss the connection. If you make it, oh lucky day!