anchor.diff:  KRAD,RAD,,Warroad,MN,US,48.94,-95.34,327,7,krad
   KMRY,MRY,,Monterey Peninsula,CA,US,36.59,-121.84,66,2,kmry
   CYDA,YDA,71966,Dawson,YK,CA,64.05,-139.13,369,6,cyda
  -KPRC,PRC,,Prescott/Ernest A Love Fld,AZ,US,34.65,-112.42,1524,3,kprc
  +KPRC,PRC,,Prescott,AZ,US,34.65,-112.42,1524,3,kprc
   KEAU,EAU,,Eau Claire,WI,US,44.88,-91.48,276,4,keau
  -KMGM,MGM,72226,Montgomery/Danne,AL,US,32.3,-86.4,63,4,kmgm
  -KCRE,CRE,,North Myrtle Beach/Grand Strand,SC,US,33.81,-78.72,10,6,kcre
  +KMGM,MGM,72226,Montgomery,AL,US,32.3,-86.4,63,4,kmgm
  +KCRE,CRE,,North Myrtle Beach,SC,US,33.81,-78.72,10,6,kcre
   ,,,000739,,,40.63,-79.11,428,7,000739
  -KMPV,MPV,,Montpelier/Knapp,VT,US,44.21,-72.57,343,4,kmpv
  +KMPV,MPV,,Montpelier,VT,US,44.21,-72.57,343,4,kmpv
   ,,,le1,,,41.68,-82.4,174,7,le1
   KAHN,AHN,72311,Athens Muni,GA,US,33.96,-83.32,244,4,ahn
   K9V9,9V9,72653,Chamberlain,SD,US,43.8,-99.32,519,7,k9v9
  -KLBB,LBB,72267,Lubbock Preston Smith Intl,TX,US,33.6658,-101.823,993,0,klbb
  +KLBB,LBB,72267,Lubbock Intl,TX,US,33.6658,-101.823,993,0,klbb
   PASC,SCC,,Deadhorse,AK,US,70.2,-148.47,15,6,pasc
   ,,,atl4,,,38.6,-73.75,0,7,atl4
   ,,,046047,,,32.4,-119.5,0,7,046047
   SBCY,,83362,Cuiaba/Marechal,,BR,-15.65,-56.1166666667,182,6,833620
  -KSAN,SAN,72290,San Diego/Lindbe,CA,US,32.73,-117.17,12,2,ksan
  +KSAN,SAN,72290,San Diego/Lindbergh,CA,US,32.73,-117.17,12,2,ksan
   KOPF,OPF,,Miami/Opa Locka,FL,US,25.91,-80.28,16,1,kopf
  -KGNV,GNV,,Gainesville Regnl,FL,US,29.68,-82.27,45,4,kgnv
  -NZAA,AKL,93119,Auckland Intl Ar,,NZ,-37.0166666667,174.8,6,6,931190
  +KGNV,GNV,,Gainesville,FL,US,29.68,-82.27,45,4,kgnv
  +NZAA,AKL,93119,Auckland Intl,,NZ,-37.0166666667,174.8,6,6,931190
   KDAG,DAG,,Daggett,CA,US,34.88,-116.78,587,6,kdag
   KGGW,GGW,72768,Glasgow Intl,MT,US,48.21,-106.63,694,2,kggw
  -KDRA,DRA,72387,Mercury/Desert R,NV,US,36.62,-116.02,1006,5,kdra
  +KDRA,DRA,72387,Mercury,NV,US,36.62,-116.02,1006,5,kdra
   KCON,CON,72605,Concord Muni,NH,US,43.21,-71.5,103,6,kcon
   ,,,000208,,,60.49,-149.79,648,7,000208
   KPDX,PDX,72698,Portland Intl,OR,US,45.61,-122.6,7,2,kpdx
  -MTPP,,78439,Port-Au-Prince,HA,HT,18.55,-72.35,37,6,mtpp
  +MTPP,,78439,Port-Au-Prince,,HT,18.55,-72.35,37,6,mtpp
   KEED,EED,72380,Needles,CA,US,34.78,-114.62,302,6,keed
   FZAA,,64210,Kinshasa/N'Djili,,CD,-4.38,15.43,312,6,642100
  -KBNA,BNA,72327,NAShville Metro,TN,US,36.12,-86.68,210,2,kbna
  +KBNA,BNA,72327,Nashville Metro,TN,US,36.12,-86.68,210,2,kbna
   KJHW,JHW,,Jamestown,NY,US,42.16,-79.25,525,6,kjhw
   KRUT,RUT,,Rutland,VT,US,43.54,-72.95,240,7,rut
  -RJSM,,47580,Misawa(Jasdf/Af/,,JP,40.7,141.366666667,36,7,475800
  +RJSM,,47580,Misawa,,JP,40.7,141.366666667,36,7,475800
   KAVP,AVP,72513,Wilkes-Barre/Scranton,PA,US,41.33,-75.73,291,6,kavp
   MDSD,,78485,Caucedo/De Las Amer,,DO,18.43,-69.67,18,6,mdsd
  -KGWX,GWX,,Columbus AFB/88D,MS,US,33.9,-88.33,169,8,cbn
  +KGWX,GWX,,Columbus AFB,MS,US,33.9,-88.33,169,8,cbn
   TNCM,,78866,Prinses Juliana,,VI,18.05,-63.12,4,8,tncm
   KEYW,EYW,72201,Key West Intl,FL,US,24.55,-81.75,5,2,keyw
  -K56N,56N,,Sandy Hook Cgs,NJ,US,40.42,-73.98,1,8,atlh
  +K56N,56N,,Sandy Hook CGS,NJ,US,40.42,-73.98,1,8,atlh
   ,,,b#3,,,29.3,-77.4,0,7,b#3
   KGLH,GLH,,Greenville,MS,US,33.48,-90.98,45,6,kglh
   KPIH,PIH,72578,Pocatello Muni,ID,US,42.93,-112.6,1359,3,pih
  
positive.code: ,,,tel,,,63.44,-153.36,185,7,tel
  ,,,406900,,,28.0,49.0,0,7,406900
  KJAC,JAC,,Jackson,WY,US,43.61,-110.73,1961,6,kjac
  KJAN,JAN,72235,Jackson/Thompson,MS,US,32.33,-90.08,91,3,kjan
  KCDC,CDC,,Cedar City Regnl,UT,US,37.7,-113.1,1714,4,kcdc
  HKRO,,45004,Hong Kong Ro,,HK,22.3166666667,114.166666667,66,8,450040
  SKBQ,,80028,Barranquilla/Ern,,CO,10.9,-74.7666666667,10,6,skbq
  KREV,REV,72489,Reno/Wfo,NV,US,39.5666666667,-119.8,1516,8,krev
  KFAR,FAR,72753,Fargo/Hector Field,ND,US,46.91,-96.8,277,1,kfar
  ,,,p#p,,,35.68,-95.86,219,7,p#p
  KAZO,AZO,,Kalamazoo Intl A,MI,US,42.24,-85.55,272,6,kazo
  PAWG,WRG,70387,Wrangell,AK,US,56.48,-132.396,11,6,pawg
  KIAH,IAH,72243,Houston Bush Intl Ap,TX,US,29.97,-95.35,36,2,kiah
  KPHF,PHF,,Patrick Henry,VA,US,37.14,-76.5,12,6,kphf
  KGCK,GCK,,Garden City,KS,US,37.94,-100.72,877,4,kgck
  KCOU,COU,72445,Columbia Rgnl,MO,US,38.83,-92.22,271,4,kcou
  SKSM,,80009,Santa Marta/Simo,,CO,11.1166666667,-74.2166666667,4,7,sksm
  KCLL,CLL,,College Station,TX,US,30.58,-96.37,96,4,kcll
  KMBS,MBS,,Saginaw/Tri City,MI,US,43.53,-84.08,202,6,kmbs
  KHOU,HOU,,Houston/Wm P Hobby,TX,US,29.65,-95.28,36,3,khou
  MUCL,,,Cayo Largo Del Sur,,CU,21.63,-81.55,5,7,mucl
  KIJD,IJD,,Willimantic,CT,US,41.75,-72.18,75,7,ijd
  ,,,469020,,,10.72,115.83,5,7,469020
  
negative.code: ,,,c36,,,36.6,-101.6,996,7,c36
  KGRF,GRF,74207,Fort Lewis/Gray,WA,US,47.09,-122.58,92,6,grf
  KJMS,JMS,,Jamestown,ND,US,46.93,-98.68,455,6,kjms
  ,RWD,74433,McCook Profiler,NE,US,40.09,-100.65,800,8,p#6
  KMIE,MIE,,Muncie,IN,US,40.242,-85.396,285,7,mie
  PHKO,KOA,,Kailua Kona,HI,US,19.65,-156.0,27,6,phko
  CYWA,YWA,71625,Petawawa,ON,CA,45.96,-77.31,130,6,cywa
  PGSN,,91232,Saipan/Isley,,FM,15.12,145.73,65,6,912320
  