A £50,000 reward for information about missing Dunfermline man Corrie McKeague will come to end at the weekend if no-one comes forward.
The reward was offered by an anonymous business couple in Suffolk when Corrie went missing after a night out with friends in Bury St Edmunds on September 24.
Corrie, a RAF gunner, was stationed at RAF Honington at the time.
His mum, Nicola Urqhuart said on Facebook: "Following discussion, we consider it sensible that the offer of a reward should not remain in place indefinitely.
"As such, we have decided to leave a reward in place for one more week.
"On 18th February 2017 the offer of a £50,000 reward will be withdrawn."
Mr Mckeague was last seen walking into a bin loading bay known as the "horseshoe" at 03:25am.
Police announced last week that they would begin to search a landfill site in Milton, Cambridgeshire that is linked to a bin lorry seen in the horseshoe shortly after Mr MKeague was last seen.
The bin lorry was seized early in the stages of the investigation after Mr Mckeague's phone signal followed the same route as the vehicle.
However, no traces of him were found in the lorry.
It is expected to take officers up to 10 weeks to complete the search of the landfill site.
Nicola Urqhuart added: "On behalf of my family, I would wish to publicly thank from the bottom of our hearts the couple concerned.
"Not only have they offered what would be to most of us, a life changing sum of money in the shape of the reward, they have also given their time and made great efforts to assist us find Corrie. We will be forever grateful to them for this."