Originally Posted by
bobloadmire
Shoot, I read that you could book AirTran flights with CP.
Q: Will I be able to use my Rapid Rewards Companion Pass or A+ Rewards Companion Pass for Companion travel on shared itineraries?
A: Yes. Companion Pass travel is permitted on shared itineraries.
http://www.airtran.com/faq/swa_airtr...aspx?nav_id=85
The definition of Shared Itineraries is somewhat counter intuitive and includes flights booked on Southwest, including flights flown entirely on Airtran but booked on Southwest.