Aerospace power distribution systems place demands on PCB design that are fundamentally different from those of commercial electronics. A single board in an aircraft or spacecraft may need to carry hundreds of amps across bus bars, distribute power...
https://www.high-current-pcb.com/high-current-pcb-thermal-design/high-current-pcb-design-for-aerospace-power-distribution/
Telecommunications base stations are among the most demanding environments for printed circuit board design. A single macro cell site houses power amplifiers, radio transceivers, filters, and baseband processing units — all running simultaneously, ...
https://www.high-current-pcb.com/high-current-pcb-thermal-design/high-current-pcb-design-for-telecommunications-base-stations/