In his first "Urbi et Orbi" (to the city and the world) message, Francis also called for peace between Israelis and Palestinians, an end to the civil war in Syria, and political solutions to conflicts in several African countries.
The former Cardinal Jorge Bergoglio of Argentina also condemned the "iniquitous exploitation of natural resources" and urged everyone to be "guardians" of creation.
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Syrian refugee children have been making clothes for British shoppers, it has been claimed.
A judgement is due on Monday on a Christian bakery’s appeal against a ruling that found them guilty of discrimination against a gay man.
The crash happened at about 7.20am local time as the plane was heading for Misrata in Libya.