Perhaps Seattle Avionics Voyager? I originally downloaded the free version (DUAT Voyager) and have since purchased their commercial offering. The commercial version appears to have Mexican airports and nav aids, including Cancun. I don't recall if the free version does since I didn't check that out when I was trying it out. (I've already tried planning a flight from Oregon to Hawaii in a C-152 - came up a few gallons short. :wink2 I can't get through to Seattle Avionics web site today; that's unusual.