> Zurich to Paris just takes too long by train, and doing night trains isn't always an option. It's a nudge over 4 hours by TGV from Zurich center to Paris cen

> Zurich to Paris just takes too long by train, and doing night trains isn't always an option. It's a nudge over 4 hours by TGV from Zurich center to Paris center. That is almost certainly comparable to getting from city center to airport, checking in, waiting before flight, flying, waiting for bags, and getting to city center at the other end. Of course, if your source and destination are closer to the airport and you have no bags/minimize waiting time that might tip the flight in your balance but I doubt it'd be very far off in many cases. Personally I'd much rather take the train here -- I find it more comfortable and convenient than flying and for me the overall time taken is comparable. It can also be cheap. I've had several €29 fares on that route.