Need info/advice Ferry from US to South America

[rotorboy]

Hello all,

I am tyring to gather inof as the best way to due this. There is a chance we may be moving a machine from the US to South America. I have flown in and through Mexcio so I am familair with how to do the Mexcio part of the journey. My questions have to due with Central Amercia.

the range is 250-270nm and we need Jet A

Is it possible to overfly Guatemala or El Slavador with out landing. If possible I would like to leave Mexcio MMTP and go direct to San Salvador MSLP.

Any useful hints about crossing borders, specail flight plans etc? How far inadvnce do I need to file a flight plan, or request permisson to overfly?
From El Salvador I was thinking Manauga, Liberia, Sanjose, Boca Del toro, Panama, then down the west coast of Columbia, Ecuador and Peru.

Any help would be great

Thanks

RB