I got a BS in Aviation Science. I loved studying about something I was passionate about, and the knowledge IS useful and makes you a more qualified pilot from a knowledge perspective. However the only value it has when you do an airline interview is putting a check in a box, they don't care what you study. So really what you study works either for your own enjoyment and betterment or as a backup career qualification. A double major is pointless unless it has tied to it a degree that is specifically required for a job. There are very few BA/BS that give you a decent wage with no experience, I can only think of computer science type jobs or nursing. A degree in business is a degree in theory, which just means you get hired as an intern making low wages for a while to climb a corporate ladder, or you are a loan officer at Wells Fargo. Its a step to an MBA or by itself another degree like art history or psychology. A degree in Aviation Business is even more useless because it gives you less opportunity to get jobs outside of aviation, and little if any power to get you a job paying 35k+ in an airline if at all. The majority of the jobs in aviation that pay well dont want aviation business degrees, they want Marketing, accounting, communication, etc. Aviation management jobs in flight operations are experienced line pilots, mechanics etc that moved up the ranks after years of experience.
Long story short, if your going to spend more TIME (money too but you gotta money-tree in the backyard) getting 2 undergrad degrees, dont. Spend that time (& money) getting a graduate degree in a masters, MBA, etc. Once you get a degree you will see how even outside aviation, it is just a minimum requirement, and you will see job openings require xxx amount of years of experience in that field. So get your degree, and get to work. Most boss's care less about what you've studied and more about what you've done! That's really the best qualifier, work experience!