Amelia Lost: The Life and Disappearance of Amelia Earhart

Call letters are the unique combinations of letters assigned to a radio station or aircraft and are used for identification during radio transmissions. Earhart’s plane carried the call letters “KHAQQ,” which she repeated during her final distress calls as she searched for Howland Island. In the 1930s, when aviation radio technology was still developing, these call letters functioned much like a name or fingerprint, allowing ships, planes, and ground stations to recognize who was transmitting.

A directional finder is a device used to locate the source of a radio signal by rotating a loop antenna until the signal fades to its weakest point, which indicates the signal’s direction. In Earhart’s case, the Itasca broadcast signals that Earhart was supposed to detect using her own onboard directional finder, helping her navigate toward the island. However, the system was never fully tested with Earhart’s equipment before she departed, and Earhart herself had minimal training in using it.

Chosen because of its location midway between Hawaii and Australia, Howland Island offered a place to refuel during one of the longest and most remote stretches of Earhart’s journey. However, Howland’s small size made it an extremely difficult target to locate from the air, especially with only basic navigational tools and no modern GPS. Howland Island had to be specially prepared for Earhart’s flight. 

At Earhart’s request, the US government constructed an airstrip on the island, turning an otherwise uninhabited patch of coral into an important link in her global route. With no permanent population and no natural sources of fresh water or food, the island was essentially a bare, windswept strip with little margin for error if a plane missed it. Its remoteness also meant that rescue efforts would be slow if anything went wrong.

The Itasca was a Coast Guard cutter stationed near Howland Island. Its primary job was to serve as a radio communication relay and a visual marker, sending up columns of smoke to help Earhart locate the island. The Itasca was equipped to transmit signals that Earhart could detect with her directional finder, allowing her to take a bearing and steer directly toward the island. 

In theory, this combination of radio guidance and visual signals should have made the island relatively easy to find. However, Earhart failed to follow the communication procedures. The Itasca’s radio operators strained to hear Earhart’s voice over heavy static, trying desperately to respond, only to realize that she could not hear their messages. The Itasca’s efforts were ultimately ineffective, leaving Earhart and her navigator lost in their search for Howland Island.

The Electra was a twin-engine monoplane built by the Lockheed Aircraft Corporation and was custom-fitted for Earhart’s 1937 around-the-world flight. With its 55-foot wingspan, long range, and advanced navigation equipment, the Electra was considered state of the art. The Electra’s design made it well suited for long-distance flight, but it was complex to operate and required skill to handle, especially when fully loaded with fuel.

Built by the Lockheed Aircraft Company, the Vega was known for its speed, streamlined design, and durability. It was a single-engine monoplane, capable of flying long distances and handling challenging weather conditions. Earhart purchased her bright red Vega after her successful transatlantic flight in 1928. It became her signature aircraft for several record-setting flights, including her solo Atlantic crossing in 1932 and her nonstop flight from Hawaii to California in 1935. 

The Vega also had its limits. It was a relatively small, single-engine plane, which made ocean crossings especially risky. After her flight to Mexico City in 1935, Earhart decided that she would never fly a single-engine plane over water again, leading her to eventually purchase the larger, twin-engine Lockheed Electra for her final world flight attempt.