anchor.diff:  SBFZ,,82398,Fortaleza/Pinto,,BR,-3.76666666667,-38.5166666667,25,6,823980
   KIPL,IPL,,Imperial,CA,US,32.84,-115.57,-17,6,kipl
   MMCZ,CZM,76648,Cozumel,,MX,20.53,-86.93,5,6,mmcz
  -KANJ,ANJ,72734,Sault Ste Marie/Sanderson Field,MI,US,46.485,-84.366,218,0,anj
  +KANJ,ANJ,72734,Sault Ste Marie,MI,US,46.485,-84.366,218,0,anj
   CYOC,YOC,,Old Crow Airport,YK,CA,67.57,-139.84,251,6,cyoc
   KHFD,HFD,,Hartford,CT,US,41.73,-72.65,4,4,khfd
   CYYT,YYT,71801,St. Johns/Torbay,NF,CA,47.62,-52.75,140,5,cyyt
  
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: KHUF,HUF,72437,Terre Haute,IN,US,39.46,-87.3,179,6,khuf
  ,,,000737,,,40.47,-81.42,273,7,000737
  KFLP,FLP,,Flippin,AR,US,36.29,-92.59,219,7,flp
  KAIA,AIA,,Alliance Muni,NE,US,42.05,-102.8,1196,7,725635
  ,,,999310,,,4.8,-52.4,105,7,999310
  YPDN,,94120,Darwin,NT,AU,-12.4,130.87,30,6,941200
  KHBR,HBR,,Hobart,OK,US,35.01,-99.05,473,6,khbr
  