Cessna Citation Sovereign (C680)
Air Traffic Control Fully Certified
Other / Unknown
ATC Issue All Types; Deviation - Altitude Excursion From Assigned Altitude; Deviation / Discrepancy - Procedural Clearance
General None Reported / Taken
Airspace Structure; Procedure
Took hand off on a C680 descending from FL290 to FL250. A G200 checked on; I answered to the C680 and descended the C680 to FL240. The G200 took clearance. Then the C680 checked on descending to FL250. I again descended the C680 to FL240 and thought this was strange. Immediately the C680 said he thought the G200 took his clearance. Then the G200 said he thought he took a wrong clearance and was descending. I told him I didn't know where he was but he needed to be at his assigned altitude. I brought his Data Block up. He was in R68 airspace climbing from FL305 back to FL310. I tried to call him and tell him again to climb and maintain FL310; but he had switched back to R68. I called R68 to tell him what was happening and the pilot was checking back in telling the controller he was level and took someone else's clearance. The military using the whole state of Florida as their bombing range and ZJX and the south area having to route aircraft around or under the airspace; ORCA and COMP 2X procedures are still dangerous. The Navy is not returning the airspace and we have restrictions all day long that inconvenience the flying public and cost the airlines money. We are constantly pushing aircraft down early; descending and climbing betting on a good outcome. Hoping the aircraft doesn't hit an ALTRV. The casual factor is the airspace hot all day long; the ALTRV taking up the whole east side of Florida. The military not returning airspace when it has been negotiated. Management not forcing the Navy to return an ALTRV; the pilot's not listening and I missing the read back as a different aircraft. Send the military bombing range out over the water in the warning area. Safer and the flying public would not be so inconvenienced and the airlines would save money.
ZJX Controller voiced concern regarding the extensive amount of airspace used by the Navy; the fact that restricted airspace is rarely returned to the FAA during non use periods; the ATC workload increase and delays encountered.