on the security page you can add sites to the trusted zone by clicking on the trusted sites icon, like I have highlighted and then clicking the SITES button on the right,

then you will get this window below, add airspeedparts.com like I have and then at the bottom uncheck the box beside \"require server verification\" and then click the add button in the top right corner.

Now I am not sure if it will work but its worth a shot, you will then have to close your browser, reopen it and do not go to airspeed, go in and delete your cookies again and then try logging in to airspeed.
Its worth a shot.