Boingo now includes LaGuardia access: You know, this barely deserves a mention except that it furthers one of my pet theories, that is the catalyst for widescale uptake in hot spot network subscriptions is that 25 of the top 35 airports in the US will offer substantial Wi-Fi service throughout their terminals.
The minute a business traveler truly understands that in the majority of their travels, for a flat rate of $30 to $50 per month (depending on operator), they can have unlimited access, then the wall falls down, and the customer base surges.
Until then, it's a patchwork, no matter which network or aggregated service you're looking at.
The airport model is particularly interesting because of announcements like Boingo's. Because airports are almost exclusively pursuing vendor-neutral agreements in which one infrastructure firm handles the wiring and billing, and any network can overlay via fee settlement, you should have every network from T-Mobile on down in scale wanting to include airports in their coverage map.