The last confirmed sighting of Corrie McKeague, 23, was in the early hours of September 24 after he had been with friends on a night out in Bury St Edmunds, Suffolk.
Now Suffolk Police said they have received a report of possible sighting of Mr McKeague near the Hollow Road industrial estate, heading towards RAF Honington.
Officers were called by a man who told them he had been driving in the area when he spotted a man in light clothing at the back of a sugar beet factory at around 4.20am.
A Suffolk Police spokesman said: “Police are currently working to see if this can be confirmed as Corrie, however (we) are continuing to ask anyone who may have seen him anywhere in the area in the early hours of Saturday to come forward.”
CCTV footage showed Mr McKeague walking alone and eating fast food in Brentgovel Street at 3.25am.
Mr McKeague, who had the weekend off, was reported missing on the following Monday, September 26, after he failed to turn up at RAF Honington.
His mother, Nicola Urquhart, of Dunfermline, Scotland, fears someone else may have been involved but police said there was no evidence of criminality.
Police scoured woodland areas in the vicinity and also searched a bin lorry, believing his phone had been lost or discarded and ended up in rubbish.
Mr McKeague is described as 5ft 10in, white, of medium build with short, light brown hair.
He is believed to have been wearing a pink Ralph Lauren polo shirt and brown suede Timberland boots at the time of his disappearance.