by Paula RAMON Agence France-Presse SAO PAOLO, Brazil (AFP) — While Uber has changed ground transport in many cities, Sao Paulo’s infernal traffic jams have sparked a new app that opens the sky to commuters: Voom, a helicopter taxi service that charges according to distance and the passenger’s weight. It’s a godsend for those in a rush — but only if the weather permits. Gustavo Boyde, a Brazilian living in the United States who goes […]