Delta Airlines The triangular shape symbolizes the fourth letter in the Greek alphabet – delta. Looking at the colors, the blue color of the word represents the sky, while the red symbol is linked to the aircraft engines' flame.

Numerous airlines utilize a red symbol or logo as part of their brand identity. Most notably, Virgin Atlantic and Virgin Australia use the famous red script logo. Delta Air Lines features a red "widget" (a stylized delta wing) on its tail. AirAsia and Air Canada both have prominent red logos—Air Canada featuring a red maple leaf inside a circle (rondele). Other major carriers include Qantas (red kangaroo), Swiss International Air Lines (white cross on a red background), Japan Airlines (the red "Tsurumaru" or crane circle), and Turkish Airlines (red bird/wing symbol). Additionally, Southwest Airlines incorporates a red heart as its primary symbol, and Austrian Airlines uses a red-and-white chevron.