I did a quick search for this with no luck.
I don't know if i'm missing something here but 'High Priority Case' (as a perfect example) is impossible to play properly.
This mission feels like cheating when you have to kill the merry weather helicopter pilot. Call me dumb but i like to try and play the missions the way R* designed them.
So i launched the job by myself, called Lester to find me a helicopter, he either wouldn't answer or it was unavailable i don't remember. Called merry weather for the pickup and tried to get him to drop me on the roof, got shot down. I tried again and got him to drop me on the opposite building (don't remember what it's called, the tallest skyscraper that is literally across the street), sniper-ed as many enemies as i could then parachuted over to the building with the briefcase, but i then realized i'd have to spend another 1K on calling merry weather to get down.
Why does it say call me if you need a vehicle for a job? Does he mean a free roam job? Cause it never works during a mission. Perhaps you need to OWN a helicopter to play that mission the way R* designed it, in which case is stupid because the mission is available at 25 or 30 i think, and nobody has a helicopter by that level.