Great reading: ADCUS, Port entry, Fees, overtime, ETA, proper notification methods
rv8bldr said:
forgotten to check the COPA web site.
Check this out:
http://www.iaopa.org/proc/regs.html
This has lots of good concise info and many of the gotchas'.
You have to call them and there are no excuses:
A 24-hour national emergency number is available in the event you cannot reach Customs at your intended airport of arrival; dial 800/973-2867
Normal (free) entry is from 8am to 5pm local
Customs telephone numbers:
http://www.cbp.gov/xp/cgov/toolbox/contacts/ports/
here is a publication that will help:
http://www.cbp.gov/linkhandler/cgov.../travel/private_flyers.ctt/private_flyers.doc
If the link does not work just go to the US customs boarder patrol web site and search publications or try a search on "GUIDE FOR PRIVATE FLYERS"
Here is the rub, as I recall it, don't rely on ADCUS (add-cuss) or advise customs on the remarks section of you flight plan. It may work, should work but if you are not proactive and they are not notified it is a mess. I personally always call the port of entry with ETA within a 2 hours. That way if there is a SNAFU I have the name and time of the person I talked to. Before cell phones and international calling cards where popular calling was a pain. Also 1-800 numbers may not work out of the country, as I recall. So just keep that in mind.
Do your home work and call the port of entry an ask them if you have a question on what's required. You can get forms on-line and have them filled out ahead of time. Obviously all the normal precautions should be followed, passport, ID and aircraft paper work. They are cool, but they can make you take everything out of the plane and look through it. Don't give them a reason to do this (see the guide I mentioned). Last advice. If you get to a port of entry and there is no customs official to greet you don't get out or let your passengers get out and wounder around. It's not hard and straight forward, but if you don't play by the rules it can get ugly. I have heard horror stories. I never had a problem flying across the US Canadian border many times, but I have had a few miss advanced notice issues, thus my rule of calling myself. Things may have changed since I last flew out of the country in a private plane, but one thing I am 100% sure is it's the PILOTS responsibility to give advance notice and there are no excuses.