Hi Hope,
I'm not exactly clear if you want to fly yourself or yourself and your bike.
If you just want to get down yourself to Ushuaia or where ever in South America I would suggest it is cheaper to fly between major airports where there is price competition. Easy to find a flight on kayak.com from Panama City to Santiago Chile and then much cheaper to find a local bus or regional airline like Aerolina Argentina to get the rest of the way.
If you are asking about the bike too I can't help you since I haven't ever shipped a bike by plane in Central America. I should think it would be quite expensive to fly a bike to Santiago or points south.
Others may know more.
Good luck.
Kindest regards,
John Downs
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