TOP 10 - The most economical regional aircraft

Top 10 of the most economical regional aircraft. Please let me know what type of video about aircraft do you want to see. :)
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* This figure applies to all Boeing 737 MAX aircraft

Credits:
【4Ｋ】SKYTEAM 厦門航空　Boeing 737-800　成田34Ｒ　Landng -
ひめパパ成田
Przyloty i odloty samolotów - Lotnisko Chopina Warszawa #1 - Krzysztof S.
Hawaiian Airlines A321neo [N209HA] Takeoff Portland Airport (PDX)
【4Ｋ】大韓航空　Airbus A220-300　成田34Ｌ　Takeoff - ひめパパ成田
Spirit Airlines A320neo [N902NK] Takeoff Portland Airport (PDX)
4K. United Boeing 737 MAX 9 landing for the first time at Portland Airport(PDX). - H2O Aviation
【4Ｋ】イースター航空　Boeing 737 MAX8　成田34Ｌ　Takeoff - ひめパパ成田
Airbus A220 / Bombardier CSeries CS100 / Swiss HB-JBA - Raffael Greminger
Delta Air Lines N823DN 737-900ER Takeoff Portland Airport (PDX)
[4K] (Swiftair) Boeing 757-223(PCF) Landing and Takeoff at Liège Airport [EBLG] - The Mighty Spotter

economical aircraftmost efficient aircraftmost fuel efficient aircraft