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You pull up a flight on united.com, click the fare details, and see a string of letters and numbers you’ve never paid attention to before: Y9 B9 M7 H4 Q0 PZ2 FZ0. Ignore everything except the last useful one. PZ is the fare class, is the single number that determines whether your upgrade request clears […]

Learn Marriott late checkout rules by Bonvoy elite status, including who gets 4 PM checkout, where it’s guaranteed, and which hotels are excluded.

Only one of United’s four personal credit cards gets you into a United Club on a regular flight — the other three give you nothing or a couple of one-time passes. Compare Gateway, Explorer, Quest, and Club Infinite, plus what buying United Club membership outright actually costs.

Authorized user spending counts toward your welcome bonus minimum spend on nearly every major card — but the fee to add one ranges from $0 to $400 a year. Compare authorized user fees, age requirements, and the real math across Chase, Amex, Capital One, Citi, and Bilt.

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See which rewards programs transfer points to United MileagePlus, transfer ratios and times, plus the difference between transfer partners and airline partners.

Chase Sapphire Reserve, Capital One Venture X, and Amex Platinum have all quietly dropped the Priority Pass restaurant credit — see exactly which cards still include the $28 dining credit, plus how Priority Pass Digital Membership works for US travelers.

United and JetBlue let you pool miles with family for free. Delta charges $0.01/mile plus a $30 fee for the same thing. Compare family pooling and points transfer rules, fees, and limits across every major US airline and hotel loyalty program.

Lounge access hides four different products behind one marketing phrase. Compare what Chase Sapphire Reserve, Amex Platinum, Capital One Venture X, Delta Reserve, United Club Infinite, and AAdvantage Executive actually get you into — network, guest limits, and real fees included.