Robert Kincaid, from the Tullycarnet area, was due to arrive in Dublin on the evening of July 17, but never boarded his flight.
The 38-year-old oil rig worker was returning from a stint working at a west African site in Benin and was set to board his connecting flight from Charles De Gaulle airport in Paris.
Louis Kincaid, Robert’s brother, said that he had also previously worked in central Africa.
His last known point of contact is understood to have been a video call with a friend made from a bar in the airport.
Louis told this newspaper: “I think he was in the airport bar having a chat basically. As far as I’m aware, there was nothing bad said, there was nothing suspicious said.
“They were just having a bit of craic over the phone.
“He’s a very sociable person, but he could have met someone in the airport bar — we just don’t know.”
The 38-year-old’s last known point of contact was on July 17
A friend video-called Robert again, although a stranger answered the phone instead.
“It looked like [they were in] a tin corrugated roof building. They basically said the phone [battery] was on 0% in broken English,” Louis explained.
The second and final call made to Robert’s phone was picked up by a woman, but the caller was unable to make out what was said before the line was cut off and has been uncontactable ever since.
Messages to Robert on WhatsApp and other social media are also no longer being delivered.
Robert Kincaid
News Catch Up – Monday 28th July
Louis added: “We’re in the dark. We went through the PSNI. We went through the embassy — they’ve done a fantastic job. I have to give credit to the two girls who are working there now.
“We’re trying to get some details, but there are a lot of restrictions with GDPR regarding missing people and it’s just roadblocks.”
After contacting the PSNI, Louis was directed towards the French authorities, but has found difficulty making contact from Northern Ireland.
Louis and a family friend will fly to Paris on Wednesday to meet with British embassy officials who will help the pair liaise with local police.
“There’s going to be someone meeting us.
“The Foreign Office has organised someone to meet us, it’s someone in the airport,” said Louis.
“They’re going to help us with translation, and we’re going to file an official missing persons report in Paris, and then we’re just going to be going about, putting posters all around places.”
Louis added: “He doesn’t have any contacts in France, but he is a very sociable person, he would make friends with anyone.”
He explained that his family is growing increasingly worried as time goes on.
Louis said: “They’re holding together, it’s just the unknown.
“Mum’s not really sleeping at the moment. It is starting to get to her as the days go on.”
The Paris police have been contacted for comment.