anchor.diff:  KEWB,EWB,,New Bedford,MA,US,41.69,-70.97,23,7,kewb
   ,,,lm1,,,45.33,-86.42,177,7,lm1
   ,,,915006,,,8.3,137.5,0,7,915006
  -KAPX,APX,72634,Gaylord/Alpena,MI,US,44.9,-84.7166666667,446,8,apx
  +KAPX,APX,72634,Gaylord/Alpena/WFO,MI,US,44.9,-84.7166666667,446,8,apx
   KLIC,LIC,,Limon,CO,US,39.2734,-103.667,1630,4,lic
   KLGB,LGB,72297,Long Beach,CA,US,33.83,-118.15,10,6,klgb
   KFOD,FOD,72549,Fort Dodge,IA,US,42.55,-94.18,355,6,725490
  
positive.code: KMLS,MLS,74230,Miles City,MT,US,46.44,-105.87,801,4,kmls
  KDVN,DVN,74455,Davenport,IA,US,41.62,-90.58,230,3,dvn
  ,,,915012,,,7.4,149.2,0,7,915012
  KAIA,AIA,,Alliance Muni,NE,US,42.05,-102.8,1196,7,aia
  PAGK,GKN,70271,Gulkana,AK,US,62.15,-145.45,481,6,pagk
  ,,,b#f,,,46.1,-131.0,0,7,b#f
  CYZS,YZS,71915,Coral Harbour,NU,CA,64.2,-83.37,64,5,cyzs
  
negative.code: ,,,000237,,,34.34,-117.4,923,7,000237
  EGVN,,3649,Brize Norton RAF,,GB,51.75,-1.58,88,7,003649
  KFRI,FRI,72455,Junction City,KS,US,39.055,-96.765,325,6,fri
  KOQU,OQU,,N. Kingston,RI,US,41.61,-71.42,6,7,koqu
  ,,,c28,,,34.5,-82.5,244,7,c28
  ,,,000277,,,38.49,-121.22,33,7,000277
  MGSJ,,78647,San Jose,,GT,13.9166666667,-90.8333333333,9,6,mgsj
  