More than 50 emergency workers, tracker dogs and a helicopter have been searching for an Air NZ pilot who went missing on a tramp in Hong Kong.

A woman who believes missing mother Carmen Thomas cried out for help at a carpark days before she went missing is plagued by guilt that she didn't speak to her.

'We had a bit of an upside-down relationship,' said Teresa Scott, mother of missing Carmen Thomas. 'But I was always there.'

Several items belonging to missing Auckland mother Carmen Thomas and her car are unaccounted for, say police.

Carmen Thomas' mother has now met with her daughter's son for the first time since he was a baby.

The mother of missing Auckland woman Carmen Thomas has been filming Police Ten-7 since arriving from South Africa.

Police will watch CCTV footage from up to 100 bars as the search for missing woman Carmen Thomas intensifies.

Police say they've received unconfirmed sightings of Carmen Thomas but need help to confirm them and explain what has happened to her.

Auckland escort Carmen Thomas has been missing for over a fortnight.

The owner of the club where a missing escort worked said she had been sent threatening texts from a manager at her former agency.

Police say they are "preparing for the worst" after the discovery of a missing woman's car and say her work as an escort may have heightened her chances of coming to harm.