The view along the wing of Viva’s new A320neo aeroplane is of a sparkling yellow wingtip. I glance out the window along it before take-off from Bogota, the capital of Colombia, to Cartagena, a beautiful historic city on its Caribbean coast. A middle-aged woman beside me tugs at my sleeve. She is asking me in Spanish how her seatbelt works, and I show her. I gather it is her first time ever on a plane. This is not an unusual occurrence on Viva. Since its first flight on May 25, 2012, the low fares airline has made flying accessible to…