Mexico City is 3 hours ahead of Anchorage
Best overlap: 8:00 AM to 3:00 PM in Anchorage is 11:00 AM to 6:00 PM in Mexico City.
For the smoothest call, aim inside 8:00 AM to 3:00 PM in Anchorage, i.e. 11:00 AM to 6:00 PM in Mexico City. That's a roomy 7 hours of common time each day, so finding a slot that suits everyone is rarely a problem. Note that Anchorage follows daylight saving while Mexico City stays put, so the times above drift by an hour seasonally.