I'm a bit confused, which is par for the course.
What if you have a connecting flight through MEX? do you still have to go through customs?
Flight in Question is this:
SJD -> MEX (AeroMexico)
MEX -> ATL (Delta)
ATL -> ALB (Delta)
All bookable via Delta.com
I thought you'd go through customs at ATL, not MEX.
But Delta's website has a particular flight with only a 45 min. connection in MEX, and by all accounts that's not a legal MCT? (Unless I'm reading things wrong, which is entirely possible).