If so I think you will find that the U.S. has a requirement for the authority for such areas to have radar surveillance coverage so they can knock it off in the event of seeing a transit
Was quite some time ago
CM, military training area, there were no comms with an ATC unit required, don't know about the airline traffic, you were never aware of the airline traffic until you eyeballed the aircraft. All strictly VFR 0 to 10,000, if IMC prevailed we were unable to operate in that particular block below 10,000.