Elijah Hoard was dropped off by his father at Chicago O'Hare International Airport on Friday as he was set to return home to France.

However, Chicago police are now looking for the missing man as the family says Hoard never got on his flight.

The search continued Sunday for the 23-year-old man who went missing after visiting his father in Chicago.

Elijah Hoard spent 10 days in the city. A photo with his father shows was the last time he was seen on Friday as he was set to take off for France from O'Hare.

But, his father, Antwon Hoard, says he never checked in for his flight.

"To my knowledge he was going to just register his ticket and get on the flight but for whatever reason he never took the flight his bags weren't registered, and he never checked in, so what we're thinking is he could possibly be floating around the airport or something, but again, that's the last we've seen of him," Antwon Hoard said.

Antwon Hoard says his son suffers from mental illness and was reluctant to return home to France after spending time in Chicago.

"Everything seemed pretty normal the first eight days, but the last two days his whole mood had swung, and he was really adamant about not going back home, and he didn't want to go home," Antwon Hoard said.

Chicago police have officially reported him missing and are now looking into surveillance cameras around O'Hare airport.

The father says Elijah's phone has been off since Friday evening, and he doesn't have much money to be on his own for more than a few days. The family is now hoping anyone around the airport may help find his son.

"Obviously when you have a missing child it's all unsettling, but I'm not the type of guy that's going to be nervous or overreact until we have more information," Antwon Hoard said.

Elijah is about 6'3" and 220 pounds, and he was last seen in a brown hoodie.

Anyone who may see him has been asked to call Chicago Police.