I'm getting the
Continental.com could not find any available seats meeting your requirements. You may modify your search criteria, or call 1-800-300-1547 for assistance.
for flights tis summer/early fall

or this when researching late Nov flights BOS - GIG
Continental or its partners offers service between Boston, MA (BOS) and Rio de Janeiro, Brazil (GIG) on Sundays, Mondays, Tuesdays, Fridays, Saturdays. Please modify your search criteria.