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  dlat = lat2 - lat1 
  dlon = lon2 - lon1 
...
    if x > 0 then tc1 = 0
    if x < 0 then tc1 = 180
    if x = 0 then [the 2 points are the same]

 #!/usr/bin/perl 
use POSIX qw(ceil floor); 
open(INPUT, $infile);
...

print OUTPUT "</Folder></kml>";

"rowid","aircraft_id","actual_date_time","latitude","longitude","radio
+_altitude","ground_speed","thrust_engine_1","thrust_engine_2"
3828994,599,2012-11-04 14:00:00,51.47592545,-0.437049866,-9.0,2.0,0.04
+4653355,0.041778761,1.74208527619370935228499282740898271690901934191
+164070390564,15.22092881857486030932218666006017736321211426212568671
+811012
...
3828998,599,2012-11-04 14:00:02,51.47592545,-0.437049866,-9.0,2.0,0.04
+4653355,0.041778761,1.74208527619370935228499282740898271690901934191
+164070390564,15.22092881857486030932218666006017736321211426212568671
+811012
3828999,591,2012-11-04 14:00:02,51.47598267,-0.435331702,-0.625,0.0,0.
+066208174,0.068682498,0.913095793953437657822846430541224159086453865
+40627114668956,4.8940906898850944664550883969746212941234464464906348
+3492349
3829000,599,2012-11-04 14:00:03,51.47592545,-0.437049866,-9.0,2.0,0.04
+4653355,0.041