While you have a Premium economy flight ticket reserved with Aeromexico due to its fewer features, you are not getting satisfaction and comfort. So, at that point in time, the airline allowed the option for an Aeromexico business class upgrade, and to get the steps for it, you need to read the following passage. You will get the best business class seat and services. 

• Go to Aeromexico's official website and click login the account tab
• Here, enter the booking reference code and last name of the passenger 
• Find the ticket, select it for the upgrade, and proceed with the onscreen steps 
• You next need to choose the class preference and click the seat map tool
• Now complete the charges, if any, concerning the flight fare.
• In the end, tap over the submit button, and you will receive the complete details of the upgrade with a complete summary. 

However, travelers are also given the option of selecting the official contact number at Aeromexico to connect directly with the customer representative, and you will be able to receive complete access to make necessary upgrades for the existing flight ticket. 

What cost do I have to pay for a seat upgrade on Aeromexico?

When you proceed to upgrade your seat on an Aeromexico flight and select business class, you are required to pay for it. The charges will be around $2000, and they can be changed according to the fare type. Any other voucher or reward point applies for the selected ticket upgrade. 

Is it cheaper to upgrade a seat at the airport?

The complete upgrade of a ticket process depends upon the fare type and class you want to get an upgrade for. It also depends on which airline ticket you have purchased, so if you have a flight ticket from Aeromexico, then the charges differ according to the ticket.