A lot of international destinations won't let you come in without going through a handler such as Universal, AirRouting, Jeppesen, etc. Not to mention, it's just a whole crapload easier that way. The most popular by far is Universal. Any time someone mentions handling services, that's the name you'll hear. Call them and set up an account. If you're Part 91, you'll be working with the Foxtrot Team
As far as flying to Mexico. First and foremost, you'll need a third party Mexican insurance policy. Even if your insurance policy has worldwide coverage, you still need the separate Mexican policy. Get this document from your insurance agent. It's about $100. You MUST keep an ORIGINAL COLOR COPY in the aircraft along with a copy of your regular insurance policy. You'll also need to fax a copy to Universal so they can forward to the handler at your destination. They'll also need a copy of your airworthiness, registration, pilot and medical certificates.
As far as customs, have Universal coordinate that as well. Tell them you need customs and APIS services. eAPIS is the new system that CBP uses to check passenger information. You used to have to fill out a Form 178 and fax it to them so they could manually check the passengers, but now it is all done electronically. Some CBP offices will still require a 178, but Universal will take care of that. As far as the passengers, you will need to request the following information:
Full legal name
Date of birth
Residence country
Citizenship country
Physical Address
Passport # and expiration
For the crew, you will need:
Full legal name
Date of birth
Residence country
Citizenship country
City and state of birth
Physical Address
Passport # and expiration
Pilot's license number
You'll need to order a CBP decal sticker through
DTOPS. This can take a couple of weeks, so get on it now
Universal will take care of flight planning and weather, of course. They can also set up crew and passenger transportation (secure transportation if required), hotels, and just about anything else you could possibly need for a trip like this.
I would highly recommend you request that they send a fuel release to the FBO. This mitigates the need for you to pay for fuel with a credit card; the FBO or fueling service will bill it to Universal and it will be billed in your final invoice.
As always, carry a couple thousand dollars petty cash. If you are flying an aircraft with a steering pin or anything that may render the aircraft immobile if (easily) removed, remove it and lock it inside the aircraft. There is a history of steering pins disappearing from Hawkers in foreign countries, only to find out the handlers conveniently have a stash of them that they'll sell to you for a couple hundred bucks. Also, don't be surprised if you're greeted by a few soldiers holding M-16s. They won't bite.
If you are planning far enough in advance, you can request an border overflight exemption, again with Universal. They'll guide you through the process, and it will allow you to fly straight back home instead of stopping in southern Florida or the Gulf Coast to clear customs. Your boss will love you for this! If you plan on going out of the country more than once a year, look into a term exemption. Talk to Saad in the regulatory services department, and tell him Travis told him to stop slacking off on our renewal.
You don't quite yet need a 406 ELT, but you will on April 1, 2010. Make sure the aircraft has or will be getting one if you plan to go after that date.
Have fun and feel free to ask if you have any more questions. Where are you headed?