What Did Boeing Do To Upgrade The 737 Classic Into The 737NG Series?

The Boeing 737 series has been one of the most successful commercial aircraft of all time. The first generation, comprising the Original and Classic variants, were in production until 2000, and the Next-Generation 737s were in production from the late 1990s until 2019. It is the 26th anniversary of the first 737 Next-Generation flight, which is a good opportunity to examine the modifications Boeing made to the aircraft from the Classic era.

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