Ground stop is not affecting civil aviation flights out of local airports. At least, that's what it appears to be, since we're getting small aircraft flying out of Brackett Airport in Pomona going over us.
Now LA nbc 4 report that the issue is at the palmdale Hi alt. control center is down... no radio... so no flight over 18000 ft alowed..airlines have to fly aboue 18000ft or the burn to much fuel.. so a ground stop is in effect
Apparently, the comm outage is with Center, which handles the en-route part of IFR longer flights, not short flights made mostly by the smaller planes (either VFR or IFR just using Approach ATC)