You should be able to. They will need to see your Boarding Pass for the other airline most likely
Yes. With the one time pass, you can use the club Anytime.
Yes it will work. As long as you have a valid boarding pass for the day you want to access the club, and of course a valid club pass, it doesn't matter what airline you're flying.
no you can't.
I got in with a united one time pass and boarding pass.
No, you must be flying same day to access the United Club. See the United Club pages at United.com for access information.
It should work, they will however probably need to verify your boarding pass regardless.
You can try, but they may say no
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