Upvote:1
As of early 2023, it appears that Mexico is phasing out the FMM and no longer requires one for passengers arriving by air at its biggest airports. (I was unable to find an official Mexican government source explaining this change but several third-party websites and discussion forums agree that it is happening, as does the US government.) As such, they appear to have removed the ability for air passengers to fill out the FMM online which could previously be found on the official website.
If you arrive at a smaller airport that has not yet phased out the FMM, you will be given a paper form to fill out either on the airplane or in the arrivals area of the airport.
Upvote:9
In my experience they hand them out on the plane. There are also extras available in the airport immigration area. You could definitely fill one out in advance if you could find one somewhere, but thereβs no need to.
Oh, pro tip: Unlike other countriesβ landing declarations, Mexico has separate forms with English and Spanish instructions and headings (rather than having both languages on one form). If you do not yourself speak Spanish, make sure to grab the English one.