Note that the United airline site states you must complete a health questionnaire to enter Mexico. That is not a requirement I’ve seen anywhere here but just be aware in case it’s needed to board…
Someone also reported on Facebook they were asked for the proof of vaccination to board. That is also not a requirement and it’s strange that they had to show that…


"Travel changes you. As you move through this life and this world you change things slightly, you leave marks behind, however small. And in return, life — and travel — leaves marks on you.”
-Anthony Bourdain