The sisters of missing Brisbane woman Gaye Baker, who was last seen alive in 1972, have joined police in calling for information linked to one of Queensland's longest unsolved cases.
Miss Baker was last seen at Clayfield, on Sunday July 2, 1972, when she was meeting a man who called himself John Taylor.
In front of media on Friday, sisters Robyn Johnson and Annette Williscroft urged anyone who has been sitting on information over the last decades to come forward.
"Forty-seven years ago tragedy struck our family when our much-loved older sister Gaye went missing and has not been seen since," Ms Johnson said.
"This still has a ripple effect on our lives today."
Miss Baker, a full-time corporal in the Women's Royal Australian Air Force, was on her first "date" after taking up a job as a hostess.
She took up the role as a second income to raise money to help her ill mother.
She parked her 1971 yellow Datsun 1200 sedan in Bayview Terrace, Clayfield, to meet a man known as John Taylor. He had ordered her service through an agency to host a pool party.
Police determined the pool party was fake and the man's name was not John Taylor.
Detective Senior Sergeant Tara Kentwell said 1100 lines of inquiry were investigated at the time.
"We do believe with public assistance - irrespective of the passive of time - this crime can be solved, offenders can be brought to justice and we can provide some closure to the family and friends of Gaye," Det Snr Sgt Kentwell told media on Friday.
A $250,000 has been offered for anyone with information which leads to an arrest and conviction for Miss Baker's disappearance.
Australian Associated Press