The Maybach of the skies may finally be here. Airbus Corporate Helicopters (ACH) and Mercedes-Benz unveiled a new chopper at a showcase event in São Paulo, Brazil, in late February, taking their decade-long partnership to luxurious new heights. ACH and Mercedes first teamed up in 2010, launching a riff on the ACH145 helicopter—the corporate variant of the Airbus H145 created for high-fliers and VI...