I will be going from DFW to Munich in May. My options are (on AA) from DFW to London to Munich, or DFW/FRA on AA then train to Munich. I would actually arrive a little earlier on the train, and since I arrive about 9 in the morning, would be nice to see some countryside on the way. How difficult would it be to take the train vs just staying in the airport and flying all the way? would I be able to book straight through on the train via AA? Thanks.