Have they gone ....
Your right I just looked at all NAC's websites including the one used for enrolling nacadmissions.com and they are all gone.. nacadmissions is totally gone, just the cpanel login !!
Just looked at the whois search... the domain has expired... hence no websites...but it doesnt explain why nacgroundschool and the others are amiss...maybe server issues.
Domain ID: D3840170-CNO
Domain Name: naples-air-center.com
Domain Name IDN: naples-air-center.com
Creation Date: 1997-06-12 04:00:00 UTC
Expiration Date: 2007-06-11 04:00:00 UTC
Last Modification Date: 2003-06-05 12:44:09 UTC