Airbus says it plans to test a prototype of a self-flying vehicle to transport people in the sky above busy city streets. Testing of the “air taxi” is expected to begin before the end of the year, according to Airbus chief executive Tom Enders. “One hundred years ago, urban transport went underground, now we have the technological wherewithal to go above ground,” Enders recently told a technology conference in Germany. His comments were reported by Reuters. Enders said that while Airbus is just starting to experiment with flying vehicles, it is taking the developments “very seriously.” France-based Airbus is one of the largest airplane manufacturers in the world. It makes commercial aircraft, helicopters and space equipment.