If you can maintain an adequately fast data connection with your wireless carrier, then yes, it should be possible, at least for modest periods of time. OTOH, even a five minute long stream may not work well depending on where you are flying and the carrier performance at that location. And that's the million dollar question. How will each carrier perform at the particular altitude you will be conducting the ceremony at(?) [Make sure you have it filmed separately for a reliable backup ;).]
I'd suggest you pop over to howardforums.com for more specifics from the experts there on what your actual options are. My impression is that the greater Los Angeles area, esp. with all the topography, is quite variable among the carriers.
To avoid the somewhat less than ideal horsepower/software bugs of a cell phone, I would try a HD external webcam with a higher end laptop using a mobile broadband connection via Dongle (etc.). If you can live with Skype's standard definition, that's another way to do it if only one party wants to watch. All of the major carriers offer laptop plans for business travelers/etc. You could borrow the laptop and use a dongle for a couple weeks. CNET PC/multimedia forum(?) may be of use in this regard for the technical/hardware requirements for streaming. The real bottleneck will be the performance of the conection though.
I'm getting married aloft in a zeppelin over Los Angeles. No really honest, a zeppelin! My dilemma is this; not all my love ones can fit on board. They will be waiting at the bar or at home. I would dearly love to stream my wedding ceremony in as near to real time as possible. I've been told I can do this with a cellphone now. Is this true? Does it have to be a 4G phone, perhaps android based? My other option was potentially a satellite phone, but the cellphone would be better. Anybody out there know about this stuff? Get me to the blimp on time.