Napolitano suggested that International Civil Aviation Organization (ICAO) -- an agency of the United Nations -- set standards that would apply to all international airports, strengthening weak links in the security chain.

CNN: STORY HIGHLIGHTS

The receding breakup fear also hit momentum among governments to correct the flaws in the euro zone's makeup, slowing the push to complete a euro-zone "banking union" and to cut the links between governments with weak finances and feeble banks, which was undermining confidence in both.

WSJ: Italian Uncertainty Rekindles Euro-Crisis Fears