On Monday I will fly through MSY with my wife and in-laws. My wife and I are flying AS to SFO, and my in-laws are flying AA MSY-ORD-CWA. I'm a lifetime SkyClubs member who also has an American Express Platinum. My mother in law has a Delta credit card.
Any life advice in terms of whether all four of us will be allowed in (the language is member + 2 guests), and what we'll have to pay for the extra guest? Not sure if they will charge more/less for customers not flying Delta.