Which film is known for its iconic line "Here's looking at you, kid"?

The film recognized for the iconic line "Here's looking at you, kid" is indeed Casablanca. This line is delivered by Humphrey Bogart's character, Rick Blaine, to Ingrid Bergman's character, Ilsa Lund. Casablanca, released in 1942, is a classic romantic drama set during World War II and has become renowned for its memorable dialogue, unforgettable characters, and poignant themes of love and sacrifice. The film has left a lasting cultural impact, and this specific line has become emblematic of the movie's exploration of nostalgia and lost romance.

In the context of the other films listed, while they are all significant in the history of cinema, they do not contain this particular line. The Godfather, with its own set of iconic quotes, focuses on the dynamics of a crime family. Gone with the Wind, a sweeping historical drama, is recognized for its famous lines, particularly "Frankly, my dear, I don't give a damn." Citizen Kane, often celebrated for its innovative storytelling and cinematography, is marked by the enigmatic phrase "Rosebud." However, none of these films feature the memorable line that has become synonymous with Casablanca, making it the correct answer.