Information about airline tickets
You should search use the usual internet sites for the cheapest airline tickets*, but here are a few travel agencies that are reliable and some times offer better prices:
BACC Travel or call 1800-222-2746
Brol or call 1-888-527-2745
Discover Brazil or call 1 302 250-4634
Discover Brazil Tours or call 1-800-524-3666
Globotur or call 1800-998-5521 and ask to speak with Ana Teresa
*Note for grad students and post-docs: If you were awarded NSF funding to help pay for your airline ticket, make sure your ticket is issued by a US based carrier
(United, Delta, American Airlines, etc.)