Wake Turbulence of large aircraft is a non event because they do not climb as fast as a smaller aircraft. If a 747 takes of from an airport followed by a 737 there is no way unless the 737 climbs then dives that the wake turbulence will ever encounter the 737. Wake turbulence does not stay in the same path it falls towards the ground. Do you really think that A300 N587, I think, was climbing slower than the 747 that had left before it? The wake turbulence from that 747 would have been following a path well below that A300.
