Most landing gears are typically held up with mechanical uplocks and extended using hydraulic pressure. But aircraft have multiple hydraulic systems, so if the ‘normal’ one for extension fails, there will be a backup system (or potentially an electric backup like you see on the Boeing 787)....
Southwest Airlines (WN) is the world's largest low-cost carrier, founded in 1967 and based in Dallas, with over 800 Boeing 737 aircraft in its fleet. The airline's IATA code, WN, was initially used by Air Namibia but was chosen by Southwest due to availability and not because of Willie...
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