112 airlines (35 domestic, 77 international):
#30 - United States (Commercial):Airtran Airways - FL / TRS
Air Wisconsin - ZW / AWI
Alaska Airlines - AS / ASA
Allegiant Air - G4 / AAY
American Airlines - AA / AAL
Avelo Airlines - XP / VXP
Cape Air - 9K / CAP
Chautauqua Airlines - RP / CHQ
CommutAir - C5 / UCA
Contour Airlines - LF / VTE
Delta Airlines - DL / DAL
Endeavor Air - 9E / EDV
Envoy Air - MQ / ENY
Frontier Airlines - F9 / FFT
GoJet Airlines - G7 / GJS
Horizon Air - QX / QXE
Jetblue Airways - B6 / JBU
JetsuiteX - JSX / RSP
Mesa Airlines - YV / ASH
New England Airlines - EJ / NEA
Piedmont Airlines - PT / PDT
PSA Airlines - OH / JIA
Republic Airways - YX / RPA
SkyWest Airlines - OO / SKW
Southern Airways Express - 9X / FDY
Southwest Airlines - WN / SWA
Spirit Airlines - NK / NKS
United Airlines - UA / UAL
US Airways - US / AWE
Virgin America - VX / VRD
#5 - United States (Charter):Hop-A-Jet - HPJ
Priester Aviation - PWA
Surf Air - URF
Travel Management Company - TMC
XOJET Aviation LLC - XOJ
#5 - Africa:Egypt: Egyptair - MS / MSR
Morocco: Royal Air Maroc - AT / RAM
South Africa: Comair SA - MN / CAW, Kulula - MN / CAW, Mango - JE / MNO
#19 - Asia:Hong Kong: Cathay Pacific - CX / CPA
India: Jet Airways - 9W / JAI
Indonesia: Citilink - QG / CTV, Garuda Indonesia - GA / GIA, Indonesia AirAsia X - XT / IDX, Lion Air - JT / LNI, Nam Air - IN / LKN, Wings Air - IW / WON
Israel: El Al Israel Airlines - LY / ELY
Japan: All Nippon Airways - NH / ANA, ANA Wings - EH / AKX, Japan Airlines - JL / JAL
Jordan: Royal Jordanian - RJ / RJA
Philippines: Cebu Pacific - 5J / CEB, Philippine Airlines - PR / PAL
Qatar: Qatar Airways - QR / QTR
Singapore: Singapore Airlines - SQ / SIA
Taiwan: China Airlines - CI / CAL
United Arab Emirates: Etihad Airlines - EY / ETD
#23 - Europe:Austria: Austrian Airlines - OS / AUA
Belgium: Brussels Airlines - SN / BEL
England: BA CityFlyer - CJ / CFE, British Airways - BA / BAW, Virgin Atlantic - VS / VIR
France: Transavia France - TO / TVF
Hungary: Wizz Air - W6 / WZZ
Iceland: WOW Air - WW / WOW
Ireland: CityJet - WX / BCY, Ryanair - FR / RYR
Latvia: airBaltic - BT / BTI
Malta: Lauda Europe - LW / LDA, Malta Air - AL / MAY
Netherlands: KLM - KL / KLM
Poland: Buzz - RR / RYS, LOT Polish Airlines - LO / LOT
Portugal: EuroAtlantic Airways - YU / MMZ, TAP Air Portugal - TP / TAP
Serbia: Air Serbia - JU / ASL
Spain: Air Nostrum - YW / ANE, Iberia - IB / IBE, Vueling - VY / VLG
Switzerland: Swiss - LX / SWR
#15 - North America:Belize: Maya Island Air - 2M / MYD, Tropic Air - 9N / TOS
Canada: Air Canada - AC / ACA, Air Canada Jazz - QK / JZA, Air Transat - TS / TSC, Porter - PD / POE, Sky Regional Airlines - KV / SKV, WestJet Airlines - WS / WJA, WestJet Encore - WR / WEN
El Salvador: Avianca El Salvador - TA / TAI
Guatemala: Transportes Aéreos Guatemaltecos (TAG) - 5U / TGU
Mexico: Aeromar - VW / TAO, Aeromexico - AM / AMX, VivaAerobús - VB / VIV, Volaris - Y4 / VOI
#4 - Oceania:Australia: Qantas Airways - QF / QFA
New Zealand: Air Chathams - CV / CVA, Air Nelson - NZ / RLK, Air New Zealand - NZ / ANZ
#11 - South America:Argentina: LAN Argentina - 4M / DSM
Brazil: Avianca Brazil - O6 / ONE, Azul Brazilian Airlines - AD / AZU, Gol Airlines - G3 / GLO, TAM Airlines - JJ / TAM
Chile: LATAM Chile - LA / LXP
Colombia: Avianca Colombia - AV / AVA
Ecuador: Avianca Ecuador - 2K / GLG, LATAM Ecuador - XL / LNE
Peru: Avianca Peru - T0 / TPU, LATAM Peru - LP / LPE
Airlines without IATA or ICAO code (not included in count):Attitude Aviation
Corsair Aviation
Harvard Air Taxi LLC
Highland Aircraft LLC
Hop on Air
MAC Air Group
Mach 5 Aviation
National Jets Inc
Pilgrim Air Trans LLC
Public Charters, Inc.
Skyview LLC