A piece of 10ga wire could easily handle that current load without failure.
The airframe, BTW would ohm out far in excess of .1.
Aluminum has a "K" of 17.0/ft., Monel is 25.3 . These are the bulk of the airframe metals. (copper has a K of 10.8/ft)
(BTW, K =Ohms per 1 foot x 1 mil dia) We use this figure to determine resistances in estimating specific resistances. You need to quantify it on each part with diameters and specs to figure estimated totals. A piece of aluminum conduit, 10 feet long W/O fittings at .5 in dia has a resistance of a couple hundred ohms, the last time I ohmed one out.(been a while)
I guess what I am trying to get across to you is that you are fearing things that are unlikely, if not impossible.
As I said earlier, airframes and their related electronics are well thought out when it comes to electrons. That is what aviation electrical engineers do. I just mess with the stuff on the ground. We have similar difficulties in power plants however.
That is why we lay out ground grids, lightning arrestors and shunts to deal with HV spikes and the like.
Aircraft are built to even stricter tolerances and planned for events.
Indeed! Remember Apollo 12? Struck by lightning twice on ascent. Survived just fine.