[TheSpiceIsLife]

Wouldn't the livery on that helicopter in the photo just be a form of corporate advertising. Couldn't you paint your aircraft however you want so long as the correct registration / licensing marks are visible?

[lucaspiller]

Ryanair let you advertise on the exterior of their aircraft from €3000/month. Apparently the "cheapest outdoor medium in the world".

http://www.ryanair.com/doc/advertise/RyanairMediaCard.pdf