You’ll need to make sure your parts are certifiable, I don’t know about panel markings specifically but I know (at least in the US) the FAA or your local authorities often have incredibly specific requirements for every little part that goes into an airplane.
Really the only lasers that are compatible with CNC machines are low wattage diode laser markers, which are slow and may not be a particularly good fit. If you have a CNC machine already I don’t see why you don’t rotary engrave the parts?
That said a decent quality CO2 laser is ideally suited for laser marking painted metals, including aluminum. I would get something with a large enough bed size to suit your needs and at least 40 watts of output power, meaning if you get an import laser with a glass tube look for something with at least a 50 watt tube as you should not run those tubes at their full rated power.