@Anita1299. Thats probably because only registered insurance companies can issue Certificates of Currency (Insurance) to prove they will indemnify, the amount of cover and the start and expiry dates. Last time I checked Aircover appears to be no more than a lot of marketing statements with terms and conditions and exclusions than an actual insurance policy IMO.
Seriously though, are you talking about public liability insurance for guests and their visitors (including trades and cleaners)? If so, I'm suprised no insurance company will offer that as part of your own home insurance.
But I'm not a Kentucky insurance broker- you may need to speak to a business insurance broker.