Serious welfare concerns are held for a missing Bunbury FIFO worker who has not been seen in over four days.
William Patrick Carter, who goes by the name Bill, was dropped at Perth Airport's Terminal 3 around 12.40pm on Saturday, December 6.
The 25-year-old was due to fly his job near Karratha but never boarded his flight.
Bill is described as being about 174cm tall, of slim build, with brown hair and blue eyes.
Anyone with information on his whereabouts is urged to contact police immediately on 131 444.

Bushfire readiness takes centre stage at City of Kwinana's free Summer Sounds festival
WA Open Golf Championship to tee off at Secret Harbour Golf Links
Halls Head named WA's most persistent storm damage hotspot
Four illegal e-bikes to be crushed after police crackdown in Halls Head, Falcon
Aboriginal jobs and careers expo to attract 1000 attendees in Rockingham
Firefighters attend Lakelands home after reports of thick smoke
WA Government to ban screen use for younger students as part of six-month trial
Singleton General Store shutdown over illicit tobacco, vape sales
Concerns for missing Bertram woman
