A size of football field?
That's a lot of ad-space, man! Let Google invest in it, let them advertise and help us protecting the environment! Hey, don't be evil, guys - buy some kites for pour ship-owners! If they manage to enlarge those kites, I’ll be happy to them in Google Earth!
BTW, what about zeppelins with kites? I mean, really BIG zeppelins with BIG kites (and with BIG ads, if you like)?