In GSM/UMTS, the various UTRA standards are air interfaces, and are also (but not exclusively) referred to as "access modes".
United States Air Force | Royal Air Force | United States Army Air Forces | Royal Canadian Air Force | Indian Air Force | United States Air Force Academy | Special Air Service | Fleet Air Arm | National Air and Space Museum | Royal Australian Air Force | Strategic Air Command | Delta Air Lines | Air Canada | Israeli Air Force | International Air Transport Association | Air Training Command | United States Army Air Corps | French Air Force | Air National Guard | Edwards Air Force Base | Air Education and Training Command | Air France | Royal Naval Air Service | First Air Force | South African Air Force | Wright-Patterson Air Force Base | Air Ministry | Wacken Open Air | Civil Air Patrol | Argentine Air Force |
Contrary to the classic cell network where UMTS and GSM have a radically different air-interface, GMR-1 3G is still very similar to GMR-1 on the Layer 1 side.