I am stuck near the airport - can somebody help - they keep coming and Kade is not doing anything to help me? what do I need to do

If you are talking about the part where she is in the crater, just keep shooting them after about 5 mins they stop coming and you can continue. If you're talking about where you have to defend the plane, I just walked along side it and killed them till it told me to get into the plane for takeoff.

Stay near the wall where they come from as well, it will be harder for them to spot you, and you can just assassinate 'em and stuff. Feralness comes eventually which makes it easier.

Stay near wall and head shoot them as they drop down. use feral attack as soon as meter full