There might be a problem with the script that produces flighthistoryevents.csv. The EstimatedGateArrival "Based on Distance and Airspeed" does not make sense. 
 
As an example:
 
\InitialTrainingSet_rev1\2012_11_12\FlightHistory\flighthistoryevents.csv
 
280416658,2012-11-12 05:47:37.256-08,Arrival Estimation,EGA- Based on Distance and Airspeed