Subject
- Civil aviation[remove]94
- Airlines12
- Landing grounds11
- Air services agreements10
- Muscat Civil Air Agreement (1934)10
- Airfields8
- Air force6
- Muscat Civil Air Agreement (1947)6
- Air mail4
- Second World War (1939-1945)4
- Bahrain Civil Air Agreement (1934)3
- Seaplane bases3
- Air transport2
- Airways2
- Animals2
- Commerce2
- Convention on International Civil Aviation (1944)2
- Customs duty2
- Demography2
- Industries2