What is the significance of the triangle in Delta Air Lines' logo, which has been a key element of their brand identity since 1959?

The transportation industry is filled with iconic logos that have evolved over time to represent changing brand identities and corporate values. Airline logos in particular have fascinating histories that reflect both aviation heritage and modern design principles. This trivia question focuses on Delta Air Lines' distinctive triangle symbol and its origin story - a design element that has persisted through multiple logo iterations since its introduction.

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It represents the Greek letter Delta (Δ), which is a mathematical symbol for change
It symbolizes the three founding airports that Delta originally connected (Atlanta, Chicago, and New Orleans)
It represents the three original founders of the airline company in 1925
It was designed to represent a jet's wingspan viewed from the front