In 2015, Marriott International acquired Starwood Hotels & Resorts to become the biggest lodging company in the world. One of the most difficult parts of the transaction was merging the two loyalty programs, since Starwood’s had been one of the most popular in the industry. It took almost three years to combine them, and even after…

Michael Friedman writes for NerdWallet. Email: travel@nerdwallet.com.

The article What Is Marriott Ambassador Service? originally appeared on NerdWallet.

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