Police investigating the disappearance of Corrie McKeague are to resume their search of a landfill site on Monday, October 23.
A spokesman for Suffolk's Major Investigation Team said the extended search would last for four to six weeks.
It will concentrate on part of an area known as "cell 22", a 10,000 sq m cell of the landfill at Milton in Cambridgeshire which is next to the original site of the search.
The renewed search will cover 1,831 cubic metres.
"Careful re-checking of the data available to the Major Investigation Team has concluded the area of the original 20-week search is still the location where there was the highest likelihood of finding Corrie.
"However, the nature of waste disposal and its movement is not a precise science, hence the requirement to extend the search."
Mr McKeague, who served with the RAF at Honington, disappeared in September 2016 following a night out in Bury St Edmunds.
Police fear he may have climbed into a bin in the Horseshoe area of the town which was later collected and the waste taken to Milton.
Suffolk Police said Corrie's disappearance will now be treated as a cold case as police say there are no "realistic lines of enquiry left".
Suffolk Police said Corrie's disappearance will now be treated as a cold case as there are no "realistic lines of enquiry left to pursue".
Suffolk Police are passing the investigation into the missing airman Corrie McKeague onto a cold case team.