Some updates...
USA:
JFK
LGA
EWR
TEB
ACY
HPN
SWF
(N89 - Ellenville, NY)
PHL
PIT
BOS
CLE
CLT
RDU
FLL
MIA
MSP
PUB
PBI
IAD
MCO
ATL
IAH
HOU
DFW
SAT
DTW
DCA
ORD
SEA
SFO
LAX
LAS
COS
DEN
BUF
TTN
Canada
YUL
YYZ
YLW
YVR
YYF
World
SVO - Moscow, Russia
DME - Moscow, Russia
VKO - Moscow, Russia
VOZ - Voronezh, Russia
MSQ - Minsk, Belarus
HRK - Kharkov, Ukraine
KBP - Kiev, Ukraine
IEV - Kiev, Ukraine
LWO - Lviv, Ukraine
ODS - Odessa, Ukraine
DNK - Dnipropetrovsk, Ukraine
KIV - Chisinau, Moldova
TBS - Tbilisi, Georgia
BUS - Batumi, Georgia
GYD - Baku, Azerbaijan
ALA - Alamaty, Kazakhstan
CIT - Shymkent, Kazakhstan
TSE - Nur-Sultan/Astana, Kazakhstan
FRU - Bishkek, Kyrgyzstan
LHR - London, UK
LGW - London, UK
LTN - London, UK
STN - London, UK
LCY - London, UK
MAN - Manchester, UK
EDI - Edinburgh, UK
DUB - Dublin, Ireland
SYD - Sydney, Australia
KEF - Reykjavik, Iceland
AMS - Amsterdam, Netherlands
CPH - Copenhagen, Denmark
ARN - Stockholm, Sweden
OSL - Oslo, Norway
HEL - Helsinki, Finland
RIX - Riga, Latvia
WAW - Warsaw, Poland
KRK - Krakow, Poland
BUD - Budapest, Hungary
PRG - Prague, Czech Republic
MUN - Munich, Germany
SXF - Berlin, Germany
TXL - Berlin, Germany
FRA - Frankfurt, Germany
DUS - Dusseldorf, Germany
CDG - Paris, France
ORY - Paris, France
BRU - Brussels, Belgium
GVA - Geneva, Switzerland
ZRH - Zurich, Switzerland
BSL - Basel, Switzerland
VIE - Vienna, Austria
BCN - Barcelona, Spain
MAD - Madrid, Spain
FCO - Rome, Italy
MXP - Milan, Italy
FLR - Florence, Italy
ATH - Athens, Greece
LCA - Larnaca, Cyprus
IST - Istanbul, Turkey
SAW - Istanbul, Turkey
AYT - Antalya, Turkey
TLV - Tel Aviv, Israel
ETH - Eilat, Israel
AKT - Hameivin Yovin
LLNV - Hameivin Yovin
VDA - Hameivin Yovin
DXB - Dubai, UAE
SHJ - Sharjah, UAE
DOH - Doha, Qatar
MCT - Muscat, Oman
CAI - Cairo, Egypt
CAS - Casablanca, Morocco
AMM - Amman, Jordan
PNH - Phnom Penh, Cambodia
USM - Koh Samui, Thailand
BKK - Bangkok, Thailand
HKT - Phuket, Thailand
URT - Surat Thani, Thailand
JHB - Johor Baru, Malaysia
PEN - Penang, Malaysia
KUL - Kuala Lumpur, Malaysia
KUL LCCT - Kuala Lumpur, Malaysia
SIN - Singapore, Singapore
DPS - Bali, Indonesia
NRT - Tokyo, Japan
HKG - Hong Kong
MNL - Manila, Philippines
CEB - Cebu, Philippines
BWN - Bendar Darisalam, Brunei
CMB - Colombo, Sri Lanka
BOM - Mumbai, India
MAA - Chennai, India
GOI - Goa, India
KTM - Kathmandu, Nepal
PKR - Pokhara, Nepal (wow, what a flight)
SJO - San Jose, Costa Rica
LIR - Liberia, Costa Rica
MGA - Managua, Nicaragua
OMT - Ometepe, Nicaragua (I did not actually fly on an aircraft in/out of this airport but I drove across the runway many times and have gone airborne with my ATV, does that count?)
SAL - San Salvador, El Salvador
GUA - Guatemala City, Guatemala
BZE - Belize City, Belize
TZA - Belize City Municipal Airport, Belize
CUK - Caye Caulker, Belize
SPR - San Pedro, Belize
CUN - Cancun, Mexico
CZM - Cozumel, Mexico
MEX - Mexico City, Mexico
TGZ - Tuxtla Gutiérrez, Chiapas, Mexico
HUX - Huatulco, Oaxaca, Mexico
BAQ - Barranquilla, Colombia
PTY - Panama City, Panama
PAC - Albrook Panama City, Panama
BOC - Bocas Del Toro, Panama
DAV - David, Panama
GYE - Guayaquil, Ecuador
TUA - Tulcan, Ecuador
PTZ - Bonus points if you know this without googling
LIM - Lima, Peru
IQT - Iquitos, Peru
TPP - Tarapoto, Peru
SDQ - Santo Domingo, Dominican Republic
TAB - Scarborough / Canaan, Tobago
POS - Port of Spain, Trinidad
BGI - Barbados
BDA - Bermuda
FDF - Martinique
PTP - Guadeloupe
MBJ - Montego Bay, Jamaica
KIN - Kingston, Jamaica
135 International (Non-US) Airports...
173 total that I can recall...
There must be about a dozen more that I just can't recall, in addition to another 10-20 countries that I entered via land or sea crossing.