Pilot David has visited (landed in) a total of 91 countries but have 149 countries yet to explore.
Afghanistan
Albania
Algeria
American Samoa
Anguilla
Antigua and Barbuda
Aruba
Bahamas, The
Barbados
Belarus
Belize
Bosnia and Herzegovina
Botswana
British Indian Ocean Territory
British Virgin Islands
Brunei
Bulgaria
Burkina Faso
Burundi
Cameroon
Cape Verde
Cayman Islands
Central African Republic
Christmas Island
Comoros
Congo
Cook Islands
Costa Rica
Cote D'Ivoire
Croatia
Dominica
Dominican Republic
El Salvador
Equatorial Guinea
Falkland Islands
Faroe Islands
French Guiana
Gabon
Gambia
Georgia
Greenland
Guadeloupe
Guam
Guatemala
Guernsey
Guinea
Guinea-Bissau
Guyana
Haiti
Honduras
Hong Kong
Hungary
Isle Of Man
Jamaica
Jersey
Johnston Atoll
Kazakhstan
Kiribati
Kosovo
Kyrgyzstan
Laos
Latvia
Lebanon
Lesotho
Liberia
Libya
Libyan Arab Jamahiriya
Lithuania
Mali
Marshall Islands
Martinique
Mauritania
Mauritius
Mayotte
Micronesia
Midway Islands
Moldova
Monaco
Mongolia
Montenegro
Montserrat
Morocco
Mozambique
New Caledonia
Nicaragua
Niue
Norfolk Island
North Korea
North Macedonia
Northern Mariana Islands
Oman
Palau
Palestine
Paraguay
Rwanda
Saint Helena
Saint Kitts and Nevis
Saint Lucia
Saint Pierre and Miquelon
Saint Vincent and The Grenadines
Samoa
Sao Tome and Principe
Senegal
Serbia
Seychelles
Sierra Leone
Slovakia
Solomon Islands
Somalia
South Sudan
Sri Lanka
Syria
Taiwan
Tajikistan
Tanzania
Timor Leste
Timor-Leste
Togo
Tonga
Trinidad and Tobago
Tunisia
Turkmenistan
Turks and Caicos Islands
Tuvalu
Uganda
Vanuatu
Vietnam
Virgin Islands, U.S.
Wake Island
Wallis and Futuna
Western Sahara
Yemen
Zambia
Zimbabwe