I love ipleak, but it's only hosted in Europe. Whence also tunnelled through a VPN server here in NA, it's not as snappy as everything else that I access, which tends to be hosted on this continent.
Therefore, I propose that AirVPN set up a US server -- a separate mirror of the site for fast access from North America. I see your current server's hosted on Digital Ocean, and they offer regional load balancing. Just spin up another droplet! It needn't be costly.