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Delta has Viasat Wi-Fi on most planes. It is free with SkyMiles. It works throughout the flight.

Does Delta have Wi-Fi?

Yes, Viasat Wi-Fi

Free with SkyMiles

On most planes

How good it is

Okay

When it works

Gate to gate

It works for all of the flight, gate to gate.

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