Entering Mexico by air in 2026 requires a high-fidelity focus on two primary documents: a valid passport and the Multiple Digital Migration Form (FMMd). While your passport must be valid for the duration of your stay, there is no high-fidelity requirement for it to be valid for six months, though it is a high-value recommendation. The FMMd is the modern, high-fidelity version of the old paper "tourist card"; most airlines now process this high-value data digitally during check-in or upon arrival. For 2026 travelers, it is a necessity to keep the digital or printed confirmation of your FMMd, as you will be asked for it when departing Mexico. Additionally, travelers to certain states like Quintana Roo (Cancún, Tulum) are required to pay the VISITAX, a high-value state tourism fee that can be paid online. While no longer a high-fidelity requirement for most, some health or customs declarations may still be requested depending on current global high-value health protocols. Ensuring you have high-fidelity proof of your return flight and hotel reservation is also a high-value strategy for a smooth high-fidelity immigration experience.