Several airlines help travelers reach smaller European cities more easily by offering combined air and rail tickets. Here's how these programs work — and if they're worth it.

For example, if you purchase a coach or business ... "People are not always aware that changes (and even cancellations) to airline tickets can be made with most airlines within 24 hours of booking ...

Check with your airline first to be sure. If your flights are booked on separate tickets (for example, a Delta flight followed by a United flight, where you would check in separately for each ...