A Southwest Airlines Boeing 737-800 in the iconic 'Heart' livery soars above, showing off its distinctive blended winglets.

United Airlines Boeing 737-800 (N74856) featuring the modern 'evo-blue' globe tail livery.

Delta Air Lines Boeing 737-800 (N371DA) on short final, showcasing its blended winglets and classic livery.

Southwest Airlines Boeing 737-800 in 'Freedom One' U.S. Flag special livery at the gate.

Distinctive split scimitar winglets and the new Southwest 'Heart' livery visible; photo shows ground operations at a scenic airport.

Blended winglets are a distinctive feature of this generation of the 737; American Airlines operates one of the world's largest 737-800 fleets.

The Imua One livery was unveiled in 2022 honoring Southwest’s commitment to Hawaiian service and culture.

The aircraft sports split scimitar winglets. Sun Country is a US ultra-low-cost carrier headquartered in Minnesota.

This aircraft features Alaska's current livery with distinctive split scimitar winglets.

Delta is one of the largest U.S. 737NG operators; the registration N398DA confirms the identity as a 737-832.

Distinctive split scimitar winglets indicate a fuel-saving retrofit; these have become common on newer/upgraded 737s.