What is the Navajo code phrase for "fighter plane"?

The Navajo code phrase for "fighter plane" is represented by the term that translates to "hummingbird," which is significant in its use. The choice of "hummingbird" for this term reflects the characteristics associated with both the bird and the fighter plane, such as agility, speed, and the ability to maneuver quickly in the air. This symbolic representation aligns well with the operational utility of fighter planes in aerial combat, making it a logical and effective code word within the context of communication used by Navajo code talkers during World War II.

In contrast to the other choices, "eagle" symbolizes a more general aspect of strength and power but does not specifically convey the intricacies of flight as effectively as the hummingbird. The term "to fly" focuses more on the action rather than specifying a type of aircraft. Lastly, "Navajo language" does not pertain to the concept of a fighter plane at all, making it irrelevant for the question. Thus, the translation of "fighter plane" as "hummingbird" is both appropriate and meaningful within the code created by Navajo servicemen.