Can I fly to Mexico without a passport?

Can I fly to Mexico without a passport?

U.S. citizens must present a valid U.S. passport book or card, in addition to an entry permit (Forma Migratoria Multiple or FMM) issued by Instituto Nacional de MigraciĆ³n (INM). Travelers should be sure to enter Mexico with valid proof of automobile registration, even if remaining in the border zone.

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