According to Iran's Civil Aviation Organization, cited by the Iranian Mehr news agency on Wednesday, all the necessary measures will be taken in order to organize safe global flights on schedule in the region.
"An escalation could include restrictions on capital flows, which would be negative for Qatari banks' liquidity and funding", Moody's said, adding that total external debt was 150 percent of gross domestic product.
Saudi Arabia, Egypt, the United Arab Emirates (UAE) and Bahrain severed diplomatic relations with Qatar in a coordinated move on Monday, accusing it of backing Islamist militants and Iran.
Qatar is home to a key USA airbase, a centerpiece in the US -led coalition's fight against the Islamic State.
Mr Trump stressed the importance of countries in the region working together, the White House said.
It did not say who it might believe carried out the hack.
The official said there were enough grain supplies in the market in Qatar to last four weeks and that the government also had large strategic food reserves in Doha.
But UAE Minister of State for Foreign Affairs Anwar Gargash told Reuters in an interview that addressing financing for terrorist groups was the prime motive.
Iranian Foreign Minister Mohammad Javad Zarif was supposed to visit Turkey on Wednesday at his own request to discuss bilateral and regional matters, Turkish foreign ministry sources said.
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Saudi Arabia and its Gulf allies may have felt emboldened to move against Qatar by Trump's visit last month to Riyadh, which saw the president clearly align USA interests with the kingdom and lash out at Iran. "It is more about preventing things from getting worse", said one diplomat in Kuwait, whose leader was in both the UAE and Qatar on Wednesday for consultations.
With supply chains disrupted and anxiety mounting about deepening economic turbulence, banks and firms in Gulf Arab states were trying to keep business links to Qatar open and avoid a costly firesale of assets.
Thousands of Qataris have been unable to board flights to the UAE, Saudi Arabia and Bahrain, and cut off from relatives in those countries, in a region where cross-border marriages are common and Gulf rulers refer to each other as "brothers".
The sheikh's remarks came as efforts intensified to resolve the feud pitting Saudi Arabia and allied Arab nations against Qatar. Qatar has denied its neighbors' allegations and pledged to make sure the rift won't hurt its economy.
"On the public level, social media has been showing great support to Qatar with the hastag "Qatar is not alone", she said.
Traders on global markets anxious that Riyadh's allies would refuse to accept LNG shipments from the gas-rich Gulf state, the world's largest liquefied natural gas exporter, and that Egypt might even bar tankers carrying Qatari cargoes from using the Suez Canal as they head to Europe and beyond.
The alleged fake news item, which had Sheikh Tamim making controversial comments on Iran and Israel, immediately was picked up by Saudi and Emirati media, laying the groundwork for the crisis that began Monday.
Qatar is heavily dependent on food imports and the crisis has led to stockpiling and shortages.
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