KLM offers a daily flight in
the summer of 2009.
It seems possible to leave Amsterdam 2nd April 2010 at 2:00 pm and
arrive in Boston at 3:50 pm, with a return two days later at 7:50 pm in
Boston. With departure in Brussels, these flights would cost around 658
euro, when booked in febuary 2010. You would have the leave Brussels (BRU
11:30 am and be back there at 10:45 am.