Paper Airplane presents a peer-to-peer collaborative environment that integrates web editing and messaging. To make this concept reality would require either changing key aspects of the vision or solving a number of open problems, mostly in the area of P2P systems but also in security and user experience. One key design challenge would be to make a decentralized system work similar as today's web.While many of the details presented in the paper are not new in and of themselves, the integrated whole is novel and seems like it could be useful.