The mark consists of the gradient colors blue, purple, red, orange and yellow appearing on the body of an airplane with stylized graphic designs in black featuring flowers, canoe paddlers, waves, turtles, stars and lines, then color bands of blue, silver, red and yellow appear on the tail at the rear of the airplane with the word SOUTHWEST in white. The words IMUA ONE appears in white at the front of the plane under the window with a stylized silver heart with yellow, red and blue bands to the right of the door. The plane has a rear silver wing, silver coloring on a portion of the side engine, a silver lined door, and silver lined windshield.
The color(s) blue, purple, red, orange, yellow, black, white and silver is/are claimed as a feature of the mark.
The English translation of IMUA in the mark is "Go Forward".