I just redeemed an international ticket for someone on UA, having used the transfer miles between my CO & UA accounts successfully. The miles were available on UA within a minute. What's different about doing it on UA comes down to my having paid for the taxes, etc. with my credit card. When I received the confirmation email from UA, I reviewed it and found a note that the credit card used to pay for the taxes, etc. had to be available at check-in. I've never had to do this when I've redeemed miles for someone else straight from OnePass. I phoned UA, and was told that as long as I went to a UA counter before that person checked in, there'd be no problem, which could be an enormous pain. As it turns out, I should have a trip before my friend's, so I'll stop at the UA terminal in EWR to take care of this. But if I wasn't otherwise travelling, I'd have to make a special trip to an airport to have this done. That would be a significant pain in just about every part of my body. I hope CO's policy takes effect when the merger's done. I should add that the person I arranged the ticket for is in Winnipeg, while I'm in NYC. International rewards on CO haven't had this issue.