Chosen Solution

how to fix lightning port on iPad air 2? My son killed the port probably by pulling at the cord while plugged in.

I think you may have to solder on a new port, have you tried another cable?

Use your phone or magnifying glass to check for signs of damage inside the port (bent pins, broken part, etc.), if you think it looks ok, remove the screen and check if screws are tight/loose (there are 4 philips screws securing lighting port to the case if I’m not mistaken), your last resort is to replace the port which requires soldering.