Originally Posted by
vilas
As long as two aircraft follow different philosophies some increase decrease of separation is not avoidable. But it would be transient. May be ATC spacing was too tight or the aircraft ahead may have slowed down. Because so many buses flying for so long it's not been an issue.
Closure rate is transient, but distance change is not. Once the airspeeds return to being the same, there is no mechanism to return the distance back to the original.