The swiveling propellers have been claimed to have provided the Zeppelin NT with unique flight characteristics, such as being able to hover precisely, fly backwards, take off vertically, and turn on its axis. The functionality of the swiveling propellers allows the Zeppelin NT to carry out both take-offs and landing operations entirely in the vertical plane. During such operations, only three ground personnel are required, lowering costs and minimizing turnaround times as a consequence. In 2010, development of an improved propeller capable of quieter operation was completed.