Pilot Ronald Pietersma has visited (landed in) a total of 70 countries but have 170 countries yet to explore.
Afghanistan
Albania
American Samoa
Anguilla
Antarctica
Antigua and Barbuda
Armenia
Australia
Azerbaijan
Bahrain
Bangladesh
Bolivia
Bosnia and Herzegovina
Botswana
Brazil
British Indian Ocean Territory
Brunei
Bulgaria
Burkina Faso
Burundi
Cambodia
Cameroon
Cape Verde
Central African Republic
Chad
China
Christmas Island
Cocos (Keeling) Islands
Comoros
Congo
Congo (DRC)
Cook Islands
Costa Rica
Croatia
Cyprus
Djibouti
Dominica
Ecuador
El Salvador
Equatorial Guinea
Eritrea
Estonia
Eswatini
Ethiopia
Falkland Islands
Faroe Islands
Fiji
French Guiana
French Polynesia
Georgia
Ghana
Gibraltar
Greenland
Guam
Guernsey
Guinea
Guinea-Bissau
Guyana
Hong Kong
India
Indonesia
Iran
Iraq
Isle Of Man
Israel
Japan
Johnston Atoll
Jordan
Kazakhstan
Kenya
Kiribati
Korea
Kosovo
Kuwait
Kyrgyzstan
Liberia
Libya
Libyan Arab Jamahiriya
Lithuania
Macau
Madagascar
Malaysia
Maldives
Mali
Malta
Marshall Islands
Mauritius
Mayotte
Micronesia
Midway Islands
Montserrat
New Caledonia
New Zealand
Norfolk Island
North Korea
North Macedonia
Northern Mariana Islands
Palestine
Panama
Papua New Guinea
Paraguay
Philippines
Poland
Reunion
Romania
Rwanda
Saint Helena
Saint Pierre and Miquelon
Samoa
Sao Tome and Principe
Saudi Arabia
Senegal
Serbia
Seychelles
Sierra Leone
Singapore
Slovakia
Slovenia
Solomon Islands
Somalia
South Korea
South Sudan
Sri Lanka
Thailand
Timor Leste
Timor-Leste
Togo
Turkmenistan
Tuvalu
Uganda
Ukraine
United Arab Emirates
Uruguay
Uzbekistan
Vanuatu
Vietnam
Virgin Islands, U.S.
Wake Island
Wallis and Futuna
Western Sahara
Yemen
Zambia
Zimbabwe