Alexanda Kotey and El Shafee Elsheikh will appear in court in the US on Friday to hear families of their victims address the judge on their loss.
And in an extraordinary demonstration of his rejection of hatred, Mr Haines added:"What I would like to hear, although I don't think it will ever happen, is for Kotey to say: 'I'm sorry, what we were doing was wrong.'
Mr Haines' 44-year-old younger brother was captured by militants in Syria in March 2013 while delivering aid to the war-torn country. Mr Haines, 55, said he continues to be affected by terror attacks around the globe, and was actually in Manchester the night of the Arena suicide bomb which killed 22 people in 2017.
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