This takes origin in Trump's decision past year to withdraw the United States in the 2015 accord between world forces and Iran and inflict sanctions that are wide-reaching.
"Heightened military activities and increased political tensions in the region which present an increasing inadvertent risk to USA civil aviation operations due to the potential for miscalculation or misidentification", the FAA said in a statement.
Concerns about a possible conflict have flared since the White House ordered warships and bombers to the region to counter an alleged, unexplained threat from Iran that has seen the USA order nonessential diplomatic staff out of Iraq.
"This presents" a growing inadvertent threat to U.S. civil aviation operations on account of the possibility of miscalculation or misidentification", the warning stated.
Bahrain on Saturday asked citizens to leave Iran and Iraq and Exxon Mobil evacuated foreign staff from a southern Iraqi oilfield amid heightened fears of attacks by Iran or allied forces in the region.
Citing those "threats", Washington sent military reinforcements to the region, including an aircraft carrier strike group, a squadron of B-52 bombers, and a battery of patriot missiles.
But Trump's administration so far has rebuffed requests to brief the full House on Iran as it has for congressional requests seeking information on North Korea and Venezuela, she said at a news briefing.
Trump issued his threat a few hours after the commander of Iran's Revolutionary Guards, Hossein Salami, said on Sunday that Iran does not fear war but the USA does.
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In Tehran, the commander of the Revolutionary Guards named a new head of the force's intelligence unit on Saturday, the Fars news agency reported.
Trump has taken a hardline stance on Iran from day one, and a year ago took the United States out of compliance with the Joint Comprehensive Plan of Action (JCPOA) that secured a nuclear deal with Iran. Oman has always been seen as an intermediary between the West and Iran. He then re-imposed sanctions on Iran, targeting the nation's oil trade and finances.
Iran's foreign minister praised his country's relations with China during talks with his Chinese counterpart in Beijing amid heightened tensions and efforts by Tehran to keep its world markets open following the US withdrawal from the Iran nuclear deal.
May 8: Iran threatens to enrich its uranium stockpile closer to weapons-grade levels starting July 7 if world powers fail to negotiate new terms for its nuclear deal.
"Safeguarding the [nuclear accord] is possible through practical measures, and not only through supportive statements", Zarif was quoted as saying by the state news agency IRNA, during a trip to China and Japan.
As heightened tensions between Washington and Tehran continue to provoke warnings of potential war, Sen.
Meanwhile, Lloyd's Market Association Joint War Committee added that the Persian Gulf, the Gulf of Oman and the UAE on Friday to its list of areas posing a higher risk to insurers.