I like getting the train. First class is often similar or cheaper than the flight, it's better for the environment, it's easy to get up and walk around, and you get 4 hours of work done (instead of 2 hours of queuing, 1 hour of flying, 1 hour of queuing/waiting).
I find companies are as happy to pay a train fair as they are a flight.

And airports commonly need trains/busses/taxis to get to/from anyway.
I'd rather arrive in the city center than the outskirts