VivaAerobus (VB, Monterrey Mariano Escobedo) has filed preliminary papers with the Mexican Stock Exchange (Bolsa Mexicana de Valores - BOLSA) for its planned Initial Public Offering (IPO) due sometime later this year. No details pertaining details on pricing and number of shares were announced however. The Monterrey-based group launched in 2006 and is a joint-venture between IAMSA, Mexico's biggest bus company group, and the Ryan family that originally set-up Ryanair (FR, Dublin International).