One way flights in the Americas & Immigration

Hi there,
I am planning this trip starting in Los Angeles and ending up in Buenos Aires later this year.
I realise this is a long distance to overland it, so I am considering booking a few one-way internal flights along the way. What I am wondering is if there is a problem with arriving in a country by plane, and not having a return ticket to prove you are leaving that country.

Heres the deal.
Will be flying Sydney -> Los Angeles on a one-way ticket, but will have
1. a ticket from Los Angeles -> Mexico City one-way
2. a ticket from Buenos Aires -> Sydney one-way.

Do you think this will be enough to prove I am not over staying my welcome in any of these countries? especially the USA.

Has anyone else travelled like this, with only one-way tickets and not departing to go home from where you originally arrived in your journey.

Any info on related issues you be greatly appreciated.

Also, anyone in central and south america, or travelling there from Dec '05 to March '06 that wants to meet up and hang?

Well thanks guys

Alex

As long as you have a ticket showing that you are continuing your journey and not planning on staying, I don't think you should have a problem anywhere.
Sounds like a great trip! Keep us posted! and HAVE FUN!

Have done something like that myself. Flew from London to Cochabamba - Bolivia without a return not even back from another place. Had a bit of trouble in London when I left but nothing major. I don't think it is a problem at all because you are leaving the country over land which you just tell them and show your ticket back to Sydney.
Have a good trip.