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Boeing's 737 aircraft, one of the most widely used commercial jets, has a long history of operating both with and without winglets. Winglets are devices attached to the end of an aircraft’s wings that help reduce drag and improve fuel efficiency. While they have become common on modern jets, not all Boeing 737s feature them.
According to B737.org.uk, about 85% of 737s in service today have winglets either installed at production or retrofitted later. The decision to fit winglets depends on the specific variant and airline preferences. For example, early models like the -100 and -200 were never equipped with winglets nor offered retrofit options. Later versions such as the -300, -400, and -500 could be fitted with aftermarket packages, while more recent variants like the MAX series come standard with advanced split winglets.
The main reason some airlines opt out of installing winglets is cost. Installing a set can cost around $725,000 for parts alone, plus an additional $25,000-$85,000 for installation over a week-long period. If structural modifications are needed, costs rise further. Winglets also add weight—between 375-518 lbs (170-235 kg)—which can offset their benefits on short routes where fuel savings are minimal.
