AOPA – http://www.aopa.org/Flight-Planning/Mexico
EAPISfile.com (US and MX EAPIS filing service provider) – https://www.eapisfile.com
U.S. Customs Stickers – https://dtops.cbp.dhs.gov
EAPIS – USA – https://eapis.cbp.dhs.gov
Liga – https://www.ligainternational.org/web/Liga/default.asp
Flying Samaritans – http://www.flyingsamaritans.com
Baja Bush Pilots Association – http://www.bajabushpilots.com