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Thanks for taking the time to answer. I have called the airlines - there is a group of travelling on separate airlines. Problem comes, these code shares now have different rules from each other, we are travelling on a klm code but shares with northwest and operated by delta!!! We have no idea at this stage whose plane and whose staff we will be subjected to - and whose rules. United have been called twice and have given a different answer each time. I think they do it deliberately to confuse, then when you have more bags than allowed they can then take the liberty to charge you.