Jordanian Queen Rania participated in the rally in the country's capital, according to the newspaper.
In the end of January, ISIL threatened to kill Kasaesbeh, unless the Jordanian government released failed suicide bomber Sajida Rishawi, who participated in a terrorist attack in 2005. Jordan agreed, in principal, to the demands, but requested the proof the pilot was still alive. The extremist group ignored the request, leading to speculation that he had already been executed.
On Wednesday, Jordan King Abdullah II promised retaliation for the murder. The same day, Jordan executed two terrorists, including Rishawi.
On Thursday, Jordan launched airstrikes targeting Islamic State positions in Syria.
The Islamic state is an extremist group that seized vast territories in Syria and Iraq, and in summer 2014 proclaimed a caliphate on territories under its control. ISIL is notorious for many human rights atrocities, including executing journalists and humanitarian aid workers.