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For eco-conscious travelers, your choice of airline can make a huge difference.

A new report has rated more than 200 airlines and 33 million flights from around the globe, ranking them from best to worst for their carbon emissions and environmental impact.

The report by German non-profit, Atmosfair, said in their findings that airlines which achieve the best results are those using modern equipment, having high seating density and high rates of passenger occupancy and load utilization.

Related: The Best In-flight Culinary Experiences

In their annual Atmosfair Airline Index for 2018, published on Saturday, no airlines received an A for efficiency, and only two airlines were ranked in efficiency class B.

The British airline TUI Airways came top of the rankings for the second year running, reaching just under 80% of the possible optimum level of carbon emissions. TUI Fly, the company’s German counterpart, came in fourth.

Among the US airlines, Alaska Airlines ranked 22nd, Delta Air Lines came in 45th, United Airlines ranked 50th, and American Airlines placed 58th. Envoy Air, a subsidiary of American Airlines came 122nd.

Related: World's 'Most Excellent' Airlines Announced for 2019

Read on for Atmosfair's list in full.

Airlines Ranked From Best to Worst For Eco-friendliness

1. TUI Airways, UK

2. LATAM Airlines, Brazil

3. China West Air, China

4. TUIfly, Germany

5. Transavia.com, France

6. SunExpress, Turkey

7. Thomas Cook Airlines, UK

8. Air Europa Express, Spain

9. Condor Flugdienst, Germany

10. Juneyao Airlines, China

11. Jet2.com, UK

12. Air Europa, Spain

13. Air New Zealand

14. Vietnam Airlines

15. Beijing Capital Airlines, China

16. Siberia Airlines, Russia

17. KLM , Netherlands

18. Virgin Australia International

19. Air New Zealand Link

20. Air Caraibes, Guadeloupe

21 Avianca Kolumbien

22. Alaska Airlines, USA

22. Shandong Airlines, China

22. Sichuan Airlines, China

22. Thai Airways International

26. Air Transat, Canada

27. UTair Aviation, Russia

28. Air India Express

29. Hong Kong Airlines

30. Shenzhen Airlines, China

31. Xiamen Airlines Company, China

32. Air Canada

32. Hainan Airlines, China

34. Iberia, Spain

35. Ural Airlines, Russia

36. Finnair, Finnland

37. China Eastern Airlines

38. Japan Airlines, Japan

39. Air India

40. El Al Airlines, Israel

41. Air China

42. Batik Air, Indonesia

43. Royal Air Maroc Express, Morocco

44. Garuda Indonesia

45. Cathay Pacific, Hong Kong

45. Delta Air Lines, USA

47. Corsair, France

48. TAP Portugal

49. Qantas Airways, Australia

50. Aerolineas Argentinas

50. United Airlines, USA

52. China Southern Airlines

53. TianJin Airlines, China

54. Icelandair

55. Shanghai Airlines, China

56. Cathay Dragon, Hong Kong

57. Hawaiian Airlines, USA

58. American Airlines, USA

58. MASwings, Malaysia

58. Ukraine Int. Airlines

61. All Nippon Airways, Japan

61. Malaysia Airlines

63. Copa Airlines, Panama

64. Aeromexico, Mexico

65. Alitalia, Italy

66. Lufthansa, Germany

67. Singapore Airlines

68. Aeroflot, Russia

69. Turkish Airlines

70. Asiana Airlines, South Korea

71. Korean Air, South Korea

72. Sri Lankan Airlines

73. Air France

74. British Airways UK

75. Iberia Regional, Spain

76. Royal Air Maroc Marokko

77. QantasLink, Australia

78. SAS Scandinavian Airlines, Sweden

79. EVA Airways, Taiwan

79. SilkAir, Singapore

81. Austrian Airlines

82. China Airlines, Taiwan

83. Virgin Atlantic, UK

84. Brussels Airlines, Belgium

85. South African Express, South Africa

86. Air Algerie, Algeria

87. Pakistan Int. Airlines

87. Philippine Airlines

89. Swiss Air

90. Alaska Horizon, USA

91. Jazz Aviation, Canada

92. PAL Express, Philippines

93. ANA Wings, Japan

94. Nordic Regional Airlines, Finland

95. Gulf Air, Bahrain

96. Etihad Airways UAE

97. LOT - Polish Airlines

98. Flybe, UK

99 Lufthansa Regional, Germany

100. Qatar Airways

101. Egyptair

102. BA CityFlyer, UK

103. Oman Air

104. HOP! France

104. Kuwait Airways

106. Ohana by Hawaiian, USA

107. J-Air, Japan

108 Emirates, UAE

109. Swiss Global Air Lines

110. Saudi Arabian Airlines

111. South African Airways

112. Aeromexico Connect, Mexico

113. Austral Lineas Aereas, Argentina

114. Royal Jordanian

115. Ethiopian Airlines

116. Virgin Australia Regional

117. Air Astana, Kazakstan

118. Mahan Air, Iran

119. United Express, USA

120. TAP Express, Portugal

121. Delta Connection, USA

122. Envoy Air, USA

123. Kenya Airways

124. Egyptair Express

125. South African Airlink


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