Here's an overview of nine popular airlines' air and rail offerings:
Delta Air Lines' Air + Rail program
Delta's program helps passengers reach over 20 European cities not served by Delta. When booking, itineraries include both air and rail segments under one price. However, SkyMiles members will not earn miles for the train ride portion.
United Airlines' train partners
United collaborates with several European rail companies to assist travelers in reaching smaller towns in multiple countries. Some partners allow earning MileagePlus miles on ground transportation.
Air France's plane and train journeys
Air France offers four types of air and rail tickets with varying guidelines regarding luggage transfer between train and plane segments. Travelers can earn Flying Blue miles on most train segments.
Austrian Airlines' AIRail program
This service allows travel by train between Vienna Airport and select Austrian cities with a connection guarantee against delays.
Iberia's Train & Fly tickets
Iberia services over a dozen Spanish cities by train but finding available routes online may be challenging.
ITA Airways' AccesRail service
Italy's national airline offers combined air and rail tickets through AccesRail across various European locations.
Condor's Rail&Fly service
German airline Condor provides combined tickets in conjunction with Deutsche Bahn AG railway company starting from $34 per person per journey in second class.
Swiss' Air Rail program
Swiss enables travel to many railway stations in Switzerland as well as Munich and Bregenz with easy booking processes for combined journeys.
Lufthansa's Rail&Fly tickets
Lufthansa offers access to over 5,600 Deutsche Bahn stations throughout Germany starting at approximately $35 for a one-way adult ticket in second class.