Gogo · Air-to-Ground
Gogo ATG / ATG-4
Gogo ATG is the original in-flight WiFi: cell towers on the ground beaming signal up to passing aircraft. Slow by modern standards, doesn't work over oceans, and being actively retired across every major US carrier.
Gogo ATG launched on American Airlines in 2008 and powered most US domestic in-flight WiFi through the mid-2010s. The ATG-4 upgrade in 2012 added a second antenna for higher speeds. The system is mid-retirement: American is converting older 737-800s to Viasat. Delta finished its ATG retirement in 2024. United replaced ATG on most aircraft with Starlink and other satellite systems. Some older 737-800s, A319s, and regional jets still carry ATG hardware. It's functionally obsolete for anything beyond basic email.
Strengths
- 200ms latency, the best of any legacy in-flight system
- Reliable email and messaging when the bandwidth isn't saturated
Drawbacks
- 3-9 Mbps shared across the entire plane
- Continental US only, no service over oceans, Hawaii, or Caribbean
- Being phased out across every major US carrier
- Usually paid despite the poor performance
How fast is Gogo ATG / ATG-4 in flight?
Around 5 Mbps download in good conditions, often below 1 Mbps on packed flights. Latency is actually the system's one strength at 200ms, but it doesn't matter when total bandwidth is this thin. Email and basic browsing work. Streaming fails. Video calls fail. The system stops working past the coast, so flights to Hawaii, the Caribbean, or anywhere transatlantic get nothing.
Is Gogo ATG / ATG-4 free?
Paid on every airline using it, typically $8-15 per flight. Airlines have stopped marketing it as the system retires. When the same carrier offers free Viasat or Starlink on newer aircraft, paying $10 for slow ATG isn't a real choice.
Gogo ATG / ATG-4 FAQ
Why is Gogo WiFi so slow?
Gogo ATG is a ground-based cellular network with very limited bandwidth per aircraft. ATG-4 doubled speeds but still tops out near 9 Mbps shared across everyone on board. Satellite WiFi (Viasat at 80 Mbps, Starlink at 200+) has the capacity ATG never had.
Which airlines still use Gogo ATG?
Some older American 737-800s and A319s, scattered legacy United aircraft, and a few regional jets. Most carriers have retired or are mid-retirement. Delta finished retiring ATG in 2024.
Does Gogo ATG work over the ocean?
No. The system relies on cell towers on the ground, so anywhere past the coast it goes dark. Flights to Hawaii, the Caribbean, or transatlantic destinations have no WiFi on ATG-equipped planes.
Is Gogo ATG being phased out?
Yes, aggressively. American is converting to Viasat. Delta retired ATG in 2024. United replaced it with newer satellite systems. ATG will be effectively extinct in commercial service by 2027.
How much does Gogo ATG cost?
Historically $8-15 per flight. Airlines have stopped pricing it competitively. Many transitioning aircraft just mark WiFi as unavailable rather than offer ATG for sale.
What's the difference between Gogo ATG and Gogo 2Ku?
ATG is the ground-based cellular network. Legacy, slow, continental US only. Gogo 2Ku is the satellite successor: broader coverage including oceans, higher speeds (around 25 Mbps), but with GEO latency. Totally separate technologies that share the Gogo brand.
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