Abu Wa'el Dhiab is one of six people released from the US military prison in Cuba and brought to Uruguay in December 2014.
An American Airlines flight suffered mechanical problems soon after taking off from Dallas-Fort Worth airport.
The United States said the detention of more journalists in Turkey was part of a "troubling trend."
Ezra Kennedy, 17, of Westfield, New Jersey, had been hiking with a group of relatives and friends when he fell off Kaaterskill Falls on Wednesday.
French sources named the second attacker who killed a priest as Abdel-Malik Petitjean, 19, who was reportedly known as a potential militant.