Rechecking bags on international-to-international connection in Mexico City

Question

My friend has a flight from Lima (LIM) to London (LHR) via Mexico City (MEX), all on one ticket with Aeromexico.

I understand that Mexico, like the US, doesn't do sterile transit, so he'll have to pass Mexican immigration.

Will he also need to collect and re-check his checked bag, like in the US, or will it be loaded directly onto the second flight (like when transiting pretty much anywhere else)?

Answer 1

The Passenger FAQs page of the MEX website indicates in section 4b that bags are checked through:

If your connection is just part of an international trip, your baggage will be checked in for its final destination.