FORT WORTH, Texas — American Airlines started pouring customers Champagne Bollinger in its top-tier lounges and cabins this fall. But at headquarters, it's not time to celebrate — yet. American has fallen behind large rivals Delta Air Lines and United Airlines in the post-Covid luxury travel boom that has taken Seoul spa vacations and 40th birthday bashes abroad out of the chat and armed millions of consumers with high-end rewards credit cards . In the first nine months of this year, Delta made

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