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I have used GoGo on multiple trips and have had absolutely no issues. That being said my monthly commute was from Dallas to SFO and back. I have never tried on an intercontinental flight. American doesn't have WiFi on all of their planes yet. The only US carrier that does I believe is the newer US Virgin airline. I say go for the Manhattan (people still drink those? lol) :)
GoGo is the only in-flight WiFi that I have ever used, and I'm not even sure that other services are available. I used it after an acquaintance raved about using it on a flight and claimed it was great. Maybe it was for him, but my experience was not very positive. I had trouble connecting and when I did gain a connection, it was far less reliable than I get at a place like Starbucks or McDonalds. Of course, Mickey Dees isn't cruising along at 30,000 feet, which could make a difference. My experience was on a domestic flight so it might differ on intercontinental flights. It was acceptable for non-multimedia internet use, but that was about it. I think that VoIP may have been blocked, but even if it wasn't, I can't imagine the quality being good enough to use anyway. The cost was pretty reasonable for something related to airlines, if I recall correctly I spent less than $20 on it. If I had an expense account that covered it, I would be more inclined to close my laptop and order up one of those Manhattans and raise a glass to Sterling-Cooper.