As a foreign resident of Brazil, can I always fly domestically using only my Alien Identity Card?

I'm a Polish citizen living in Brazil. When travelling in Brazil I'm usually using a government issued ID with RNE number (Registro Nacional dos Estrangeiros - National Registry of Foreigners). I have a passport, but I prefer to leave it at home.
Next week I'm going to catch a domestic flight (São Paulo - Recife) with LATAM airlines. Their website has a section with valid documents needed for domestic travel, and for foreigners it mentions:
- Overseas passport.
- National Alien Registration (Registro Nacional de Estrangeiro, RNE) or Alien Identity Card (Cédula de Identidade de Estrangeiro, CIE).
- Diplomatic or consular identity.
- Any other legal travel document issued pursuant to international agreements signed by Brazil.
However, when I'm trying to check-in on LATAM's website, it only allows me to use my passport as a travel document:
Is their website wrong, not allowing me to put a valid travel document? Can I be sure that when I go to the airport, I'll be able to check-in only with my RNE?
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