anchor.diff:  1969/11/19,"Mohawk Airlines Flight 411","","","",43.4925,-73.61138888888888,""
   1969/11/20,"Nigeria Airways Flight 825","","","",0,0,""
   1969/12/4,"Air France Flight 212","","","",0,0,""
  -1969/12/8,"Olympic Airways Flight 954","","","",undefined,undefined,""
  +1969/12/8,"Olympic Airways Flight 954","","","",,,""
   1970/2/4,"Aerolíneas Argentinas Flight 707","","","",-26.765,-58.8,""
   1970/2/15,"Dominicana DC-9 air disaster","","","",0,0,""
   1970/2/21,"Swissair Flight 330","","","",47.53638888888889,8.239722222222222,""
   1970/3/31,"Japan Airlines Flight 351","","","",0,0,""
   1970/4/21,"Philippine Airlines Flight 215","","","",0,0,""
  -1970/5/2,"ALM Flight 980","","","",undefined,undefined,""
  +1970/5/2,"ALM Flight 980","","","",,,""
   1970/7/3,"1970 Dan-Air de Havilland Comet crash","","","",41.795833333333334,2.4594444444444448,""
   1970/7/5,"Air Canada Flight 621","","","",43.77972222222222,-79.69111111111111,""
   1970/8/9,"LANSA Flight 502","","","",-13.537777777777778,-71.96583333333334,""
  
positive.code: 1987/8/31,"Thai Airways Flight 365","","","",8.127777777777778,98.47111111111111,""
  1987/11/15,"Continental Airlines Flight 1713","","","",0,0,""
  1987/11/28,"South African Airways Flight 295","","","",-19.175,59.63333333333333,""
  1987/11/29,"Korean Air Flight 858","","","",undefined,undefined,""
  1987/12/7,"Pacific Southwest Airlines Flight 1771","","","",35.52222222222222,-120.85694444444444,""
  1987/12/13,"Philippine Airlines Flight 443","","","",0,0,""
  1988/1/2,"Condor Flight 3782","","","",0,0,""
  
negative.code: 1981/6/26,"Dan-Air Flight 240","","","",52.669444444444444,-1.3702777777777777,""
  1981/7/20,"Somali Airlines Flight 40","","","",0,0,""
  1981/7/27,"Aeromexico Flight 230","","","",0,0,""
  1981/8/13,"G-ASWI North Sea ditching","","","",,,""
  1981/8/22,"Far Eastern Air Transport Flight 103","","","",0,0,""
  1981/8/24,"Aeroflot Flight 811","","","",50.019444444444446,130.46666666666667,""
  1981/8/26,"Aeropesca Colombia Flight 221","","","",0,0,""
  1981/10/6,"NLM CityHopper Flight 431","","","",,,""
  1981/11/17,"Aeroflot Flight 3603","","","",69.29388888888889,87.30083333333333,""
  1981/12/1,"Inex-Adria Aviopromet Flight 1308","","","",41.75416666666667,8.977777777777778,""
  1983/1/16,"Turkish Airlines Flight 158","","","",40.11277777777778,32.980000000000004,""
  