Originally Posted by
jezsik
I've tried this on a few occasions. Unless I was flying out on their plane (or their partners' plane), they wouldn't let me in.
That is all depends on what card are you using to get in the lounge. If you are like a UA RCC member, you can use RCC even you are flying CX or AA. But if you are UA 1P, you can't use RCC when flying CX.