text: It seems that Charlie Thomas is just an obsolete airport, using the gnis:feature_id to look at the import source shows that it is now marked historical: 
  
  http://geonames.usgs.gov/apex/f?p=gnispq:3:0::NO::P3_FID:1386258
  
  Blanco Landing is also already present in the data, probably from the same import.