It depends. In some cases I believe they certainly do. One of the reasons cited for the demise of Alitalia was the development of Italy's high speed train netwo

It depends. In some cases I believe they certainly do. One of the reasons cited for the demise of Alitalia was the development of Italy's high speed train network, which is very good and quite extensive. I think speed is important, it does get tiring to sit on a train for 8 or 10 hours compared to a 1.75 hour flight. However, it is certainly one factor and how it compares to other modes of transport will depend on the person and situation.