On DL473 (JFK-NRT), tail number listed as 6307, with Gogo inflight WiFi - sitting in upper deck, 77K.
No issue with logging in using my monthly account.
Aircraft had the markings, but the the captain and flight crew did not know that the system was operational. The captain said that the equipment had been installed, but that it might not be fully operational yet.
Speeds are good, but a little more sluggish than typical Gogo - no surprise given following stats:
Download: 1.32 Mbit/sec
Upload: .02 Mbit/sec
Latency: 878 ms
https://www.v-speed.eu/share/653770/1
So, almost a second of latency, given a couple of bounces off satellites, not too shabby.