In case you still haven't decided, take a look at TAM website. I'll make things easier for you...

http://www.tam.com.br/b2c/vgn/v/index.jsp?vgnextoid=ef41105ac2e7b110VgnVCM1000005f 05a8c0RCRD

Look at the "ticketing" requirements. You don't need a positive space ticket to issue a Brazil Airpass, as far as I know.

Call their Call Center (USA: +1 888 2FLYTAM) and ask for Brazil Airpass.

Ticketing
  • Valid for sales and ticketing only outside of Brazil (purchase and ticketing).
  • Only one Airpass may be purchased per passenger in conjunction with the international ticket (including AD/ID and award tickets).
  • The Airpass ticket must be issued separately and must include a cross-reference of the international ticket sold in conjunction with the Airpass.
  • Applicable taxes (airport tax, security and additional taxes) must be charged when issuing the Airpass.
  • Tickets are non-endorsable/nontransferable.
  • PTA is not permitted.
  • TAM BAP / NON END must be shown in the endorsement/restriction box.
  • Fare basis – WBRPAST, LBRPAST, VBRPAST, QBRPAST or WBR2PAST, LBR2PAST, VBR2PAST, QBR2PAST.
  • Fare constructions and combinations are not permitted
Note: The ticketing time-limit and the time-limit automatically generated by the reservation system may be different. The most restrictive date prevails.