Depends on base and equipment.

All CRJ pilots pretty much get Delta and United with the ability to upgrade to first and business. Some pilots get American, no upgrades. Delta limits you to 6 ocean crossings a year. Flying to South America is not an ocean crossing.

Also, ZED agreements with 60+ companies. Jumpseat agreements with 50+ companies, some allow flowback international travel (including some Canadian companies and Air Jamaica), some only allow domestic jumpseating.