Pilot Andy Watts has visited (landed in) a total of 118 countries but have 122 countries yet to explore.
Afghanistan
Algeria
American Samoa
Angola
Antarctica
Armenia
Azerbaijan
Belarus
Botswana
British Indian Ocean Territory
Burkina Faso
Burundi
Cambodia
Cameroon
Central African Republic
Chad
Cocos (Keeling) Islands
Congo
Congo (DRC)
Cook Islands
Dominica
El Salvador
Equatorial Guinea
Eritrea
Ethiopia
French Guiana
Gabon
Ghana
Guadeloupe
Guam
Guinea
Guinea-Bissau
Guyana
Iran
Iraq
Johnston Atoll
Jordan
Kazakhstan
Kenya
Kiribati
Kuwait
Kyrgyzstan
Liberia
Lithuania
Madagascar
Malawi
Marshall Islands
Martinique
Mauritius
Mayotte
Micronesia
Midway Islands
Netherlands Antilles
Nicaragua
Niger
Nigeria
Niue
Norfolk Island
North Korea
North Macedonia
Northern Mariana Islands
Palau
Palestine
Papua New Guinea
Paraguay
Philippines
Puerto Rico
Reunion
Romania
Russia
Rwanda
Saint Helena
Saint Lucia
Saint Pierre and Miquelon
Samoa
Sao Tome and Principe
Senegal
Seychelles
Slovakia
Slovenia
Solomon Islands
Somalia
Suriname
Syria
Taiwan
Tajikistan
Tanzania
Timor Leste
Timor-Leste
Togo
Tonga
Tunisia
Turkmenistan
Turks and Caicos Islands
Tuvalu
Uganda
Uruguay
Uzbekistan
Vanuatu
Vietnam
Virgin Islands, U.S.
Wake Island
Wallis and Futuna
Western Sahara
Yemen
Zambia
Zimbabwe