Definition
A notation used on special use airspace charts and tables indicating that the controlling or using agency for that airspace does not provide direct air-to-ground radio communications with pilots operating in or near it. Pilots cannot raise the using agency on a published frequency from the cockpit; coordination must occur through other means, typically the controlling ATC facility or by telephone before flight.
Plain English
It means you can't talk to the people who run that airspace by radio while you're flying. If you need to coordinate with them, you have to do it through air traffic control or by phone before you take off.
Context Anchor
Seen in chart or handbook information for special use airspace, such as a warning area, restricted area, or military operations area.
Why Pilots Care
If a special use area is hot and you want to transit or get a real-time status, knowing there's no air-to-ground link tells you not to waste time scanning frequencies. You'll need to ask the controlling ATC facility, who can relay or clear you through.
Intuition Check
NO A/G does not mean radios are prohibited in the area. It means there is no listed direct air-to-ground contact for that special use airspace entry.
Example Sentence 1
The chart legend showed NO A/G next to the restricted area, so the pilot called the controlling ARTCC to request transit rather than trying to contact the range directly.
Example Sentence 2
Before entering the MOA the briefing confirmed NO A/G, requiring all coordination to occur prior to entry.