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Aeromexico has Viasat Wi-Fi on its e190s. It is free messaging.

Does Aeromexico have Wi-Fi?

Yes, Viasat Wi-Fi

Free messaging

On its E190s

How good it is

Okay

Where it works

World map: Viasat covers everywhere except near the poles, beyond about 65° north or south

Everywhere except near the poles, beyond about 65° north or south.

Sources