Synchronizing flight pattern btw groups

[MrZ 0]

Two Apaches are supposed to cover a Blackhawk during a Black Op insertion. Unfortunately, since they are two separate groups, the never give the impression of being on the same mission since one group flies far ahead and then that group stops and the other one takes the lead. Is there someway of doing a synchronization btw the two groups? Maybe joining the Blackhawk to the Apaches and then unjoining them once it's time for the Blackhawk to land? If so, then how do I give separate waypoints for the Blackhawk to follow once it disbands from the Apaches?

Thanks