What does Deadhead (DHD) refer to in aviation?

Deadhead (DHD) specifically refers to a crew member traveling as a passenger on company business. This term is commonly used in the aviation industry to describe situations where pilots or flight attendants are not actively working a flight but are instead flying to a location to start their work or to return to their home base after completing a series of flights.

This practice is necessary for logistical reasons, helping ensure that crew members are in the right place at the right time to operate flights safely and efficiently. It allows airlines to manage their workforce effectively while maintaining compliance with regulations regarding crew rest and duty hours. In contrast to a paying passenger, a deadheaded crew member does not purchase a ticket for travel but is instead traveling under the airline's operational requirements.