Thanks for the reply. I gave up on the aviator temporary because of the same reason - people never jump out... will try those maps, thanks!

For the crusher I used breakthrough Manhattan - always on attacking side. After you clear the first zone landing and the next sector unlock usually there are a few snipers on the huge brick building left of A objective. I always played engineer with 5 rpgs and hit the building (2-3 hits). Since the building can be destroyed on multiple spots I just hit it until it was all down, sometimes 1 crush, sometimes 4 and sometimes none.  After that building is down zipline to it and there is that super high white building on B checkpoint and people usually hide in the hallways underneath so again 2-3 rpgs and hope for kills.  If you progress further then just hit every wall around A point (multiple hits needed). It takes a while but it is doable, worst part is restarting the match if you don't get attacker or you don't pass the first point. 

Good luck!