I've got about 200k points and an urge to use them.

If I log in to my Southwest account, hit Redeem For More Rewards (takes me to awardhq.com), and go to Other Travel > International Flights (takes me to rewardingescapes.com), I can use my Southwest points to book flights on US Airways, Delta, etc.

Can I use my companion pass to double these up, or only for Southwest's own fights (like to Cancun, etc)?