Thought I'd drop this link in here - it's an AsiaBizTech article about how NTT DoComo will begin offering wireless hotspots o­n airplanes [1] through their mzone wireless LAN service, and Boeing's Connexion technology.
We first heard about Connexion back at Mitsubishi's R&D event in February [2]. According to the specifics of Mitsubishi's antenna (and assuming this same antenna will be used o­n the planes offering this service starting in August), the maximum downstream is 20Mbps and the upstream 1Mbps.