Royal Mail Air Mail isn't available to:
Afghanistan, Algeria, American Samoa, Angola, Anguilla, Antarctica, Antigua and Barbuda, Argentina, Aruba, Azerbaijan, Bahamas, Bahrain, Bangladesh, Barbados, Belgium, Belize, Benin, Bermuda, Bhutan, Bolivia, Botswana, Bouvet Island, Brazil, British Indian Ocean Territory, Burkina Faso, Burundi, Cameroon, Central African Republic, Chad, Chile, Colombia, Comoros, Congo, Costa Rica, Cote D'Ivoire, Cuba, Djibouti, Dominica, Dominican Republic, Ecuador, Egypt, El Salvador, Equatorial Guinea, Eritrea, Ethiopia, Falkland Islands (Malvinas), French Guiana, French Southern Territories, Gabon, Gambia, Ghana, Grenada, Guadeloupe, Guatemala, Guinea, Guinea-bissau, Guyana, Haiti, Heard and Mc Donald Islands, Honduras, India, Iran (Islamic Republic of), Iraq, Israel, Jamaica, Jordan, Kazakhstan, Kenya, Kiribati, Korea, Democratic People's Republic of, Korea, Republic of, Kyrgyzstan, Lebanon, Lesotho, Liberia, Libyan Arab Jamahiriya, Madagascar, Malawi, Maldives, Mali, Marshall Islands, Martinique, Mauritania, Mauritius, Mayotte, Montserrat, Morocco, Mozambique, Namibia, Nauru, Nepal, Netherlands Antilles, Nicaragua, Niger, Nigeria, Northern Mariana Islands, Oman, Pakistan, Palau, Panama, Paraguay, Peru, Puerto Rico, Qatar, Reunion, Rwanda, Saint Kitts and Nevis, Saint Lucia, Saint Vincent and the Grenadines, Sao Tome and Principe, Saudi Arabia, Senegal, Seychelles, Sierra Leone, Somalia, South Africa, Sri Lanka, St. Helena, St. Pierre and Miquelon, Sudan, Suriname, Svalbard and Jan Mayen Islands, Swaziland, Syrian Arab Republic, Tajikistan, Tanzania, United Republic of, Togo, Tokelau, Trinidad and Tobago, Tunisia, Turkmenistan, Turks and Caicos Islands, Uganda, United Arab Emirates, United States Minor Outlying Islands, Uruguay, Uzbekistan, Venezuela, Virgin Islands (British), Virgin Islands (U.S.), Western Sahara, Yemen, Yugoslavia, Zaire, Zambia, Zimbabwe