From a FoxNews story:
"Al-Kaseasbeh was carrying out air strikes against the militants when his warplane crashed near the northern Syrian city of Raqqa, the Islamic State group's de facto capital. The group has executed captured Iraqi and Syrian Muslim soldiers in the past -- it follows an extremist version of Islam that considers rivals, even some Sunni Muslims, as apostates. Still, the group may want to negotiate a prisoner swap or other concessions from Jordan.
The pilot's father, Safi Yousef al-Kaseasbeh, made his plea while speaking to journalists in the Jordanian capital, Amman.
"I direct a message to our generous brothers of the Islamic State in Syria: to host my son, the pilot Mu'ath, with generous hospitality," he said. "I ask God that their hearts are gathered together with love, and that he is returned to his family, wife and mother."
"We are all Muslims," he added.