Australian Peter Greste said Tuesday in New York City that they're also seeking support from world leaders attending the U.N. General Assembly.
Last week, Egyptian President Abdel-Fattah el-Sisi pardoned other journalists still in Egypt who were found guilty of broadcasting what authorities said were false reports.
Greste was not on the list, nor were the two others with him in New York: Dominic Kane, an Al Jazeera producer, and Sue Turton, a former Al-Jazeera correspondent.
They remain convicted criminals, tried in absentia for allegedly colluding with the banned Muslim Brotherhood group.
Greste was freed from an Egyptian prison in February.