Interesting question about corporations. They do not have natural rights and can’t vote, so that is the argument that they shouldn’t be permitted to lobby for the outcome of voting. The counterpoint of course being that they have a right to freely express themselves, representing the speech of their stockholders. Presently that is the law of the land. In any case, I would suggest in the case of aviation medicals that they be permitted to make their own determinations of what is required of their pilots using their property. Might work better to let them and their insurance companies decide on appropriate safety procedures (and hold them legally responsible for all damages caused by use or abuse of their aircraft). That puts the economic incentives more in line with liability and safety.